Compare it to Forza 3 that was released a year before GT5. They manage to get a bunch of cars that GT5 doesn't have.
2010 Acura TSX V6
2009 Alfa Romeo Mito
1971 AMC Javelin AMX
1964 Aston Martine DB5 Vantage
2009 Aston Martin DBS
2010 Aston Martin One-77
2010 Aston Martin Rapide
2010 Aston Martin V12 Vantage
2009 Audi Q7 V12 TDI
2006 Audi RS4
2010 Audi S4
2007 Audi S5
2010 Audi TT-RS
2010 Bentley Continental GT
2010 Bentley Continental SS
2010 Bertone Mantide
1971 BMW 3.0 CSL
1991 BMW M3 E30
1997 BMW M3 E36
2010 BMW M6
2009 BMW X5
2010 BMW X6M
2011 BMW z4 sDrive35is
2004 Cadillac CTS-V
2009 Cadillac CTS-V
2011 Cadillac CTS-V Coupe
2009 Chevrolet Aveo5 LT
1979 Chevrolet Camaro Z28
2005 Chevrolet Cobalt SS
1970 Chevrolet El Camino
2008 Chrysler 300C SRT-8
2004 Chrysler PT Cruiser GT
2011 Citroen DS3
1971 De Tomaso Pantera
2010 Devon GTX
1996 Dodge Stealth RT Turbo
1957 Ferrari 250
1984 Ferrari 288
1999 Ferrari 360 Modena
1991 Ferrari 512 TR
2002 Ferrari 575M Maranello
2010 Ferrari 599XX
2004 Ferrari 612 Scaglietti
2003 Ferrari Challenge Stradale
1969 Ferrari Dino 246
1994 Ferrari F355
1995 Ferrari F50
2005 Ferrari FXX
2010 Fiat Punto EVO
2009 Ford Fiesta
2010 Ford Fusion
2007 Ford Shelby GT500
1987 Ford Sierra RS500 Cosworth
1993 Ford Mustang SVT Cobra R
2010 Ford Taurus SHO
2010 Gumpert Apollo S
2010 Holden HSV w427
1999 Honda Civic SI
2006 Honda Civic SI coupe
2009 Honda Fit Sport
2004 Honda Mugen Civic Type R
2010 Honda Mugen Civic Type R
2005 Honda NSX Type R GT
2010 Hyundai Genesis Coupe
1956 Jaguar D-Type
2009 Jaguar XKR-S
2009 Jeep Grand Cherokee SRT-8
2010 Joss JT1
2010 Kia Forte Koup
2002 Koenigsegg CC8S
2008 Koenigsegg CCGT
2006 Koenigsegg CCX
1997 Lamborghini Diablo
2006 Lamborghini Miura Concept
2008 Lamborghini Reventon
2008 Land Rover Range Rover Supercharged
2006 Lexus IS350
2009 Lotus 2-Eleven
2006 Lotus Exige Cup 240
2006 Maserati GranSport
2004 Maserati MC12
2011 Mazda Mazda2
2009 Mazda Mazdaspeed3
2004 Mazda Mazdaspeed RX8
2009 Mercedes A200 Turbo
2004 Mercedes C32 AMG
2010 Mercedes CL65 AMG
2003 Mercedes CLK55 AMG
2010 Mercedes E63 AMG
2009 Mercedes ML63 AMG
2009 Mercedes SL65 AMG Black
2010 Mercedes SLK55 AMG
2010 Mercedes SLR Sterling MOss
2010 MINI Coupe
2009 MINI JCW
2010 Mitsubishi Colt Ralliart
1995 Mitsubishi Eclipse GSX
2010 Morgan Aero SS
2010 Mosler MT900S
1970 Nissan Datsun 510
1969 Nissan Fairlady Z 432
1993 Nissan GTR Mines
2007 Nissan Sentra SE-R
2009 Nissan Versa
2005 Panoz Esperante
2010 Peugeout RCZ
1968 Plymouht Barracuda Formula S
2002 Pontiac Firebird Trans Am
1987 Pontiac Firebird Trans AM
1973 Pontiac Firebird Trans Am
2009 Pontiac G8 GXP
2006 Pontiac Solstice
1955 Porsche 550 Spyder
1973 Porsche 911 Carerra RS
1998 Porsche 911 GT1
1995 Porsche 911 GT2
2008 Porsche 911 GT2
2004 Porsche 911 GT3
2007 Porsche 911 GT3
2007 Porsche 911 GT3 RS
2011 Porsche 911 Sport Classic
2007 Porsche 911 Turbo
1982 Porsche 911 Turbo
1970 Porsche 914
1989 Porsche 944 Turbo
1987 Porsche 959
2004 Porsche Boxster S
2010 Porsche Boxster S
2003 Porsche Carrera GT
2009 Porsche Cayenne Turbo S
2006 Porsche Cayman S
2010 Porsche Panamera Turbo
2010 Radical SR8LM
2010 Renault Megane RS250
2009 Renault Twingo Sport Cup
2010 Rossion Q1
2002 Saab 9-3 Aero
2008 Saab 9-3 Turob X
1978 Saab 99 Turbo
2000 Saleen S281
2006 Saleen S281
2008 Saleen S331
2010 Saleen S5S Raptor
2006 Saturn Ion Redline
2007 Saturn Sky Redline
2010 Seat Leon Cupra R
1965 Shelby Cobra Daytona Coupe
2010 Spada Codatronca
2010 SSC Ultimate Aero
2010 Subaru Legacy B4 2.5GT
1984 Toyota Celica Supra
2006 Vauxhall Astra VXR
2009 Vauxhall Corsa VXR
2010 Vauxhall Insignia VXR
1995 Volkswagen Corrado VR6
1992 Volkswagen Golf GTI
2010 Volkswagen Golf R
1984 Volkswagen Rabbit GTI
2009 Volkswagen Scirocco GT
2008 Touareg R50
1983 Vovo 242 Turbo EVO
2004 Volvo S60R
2010 Wiesmann GT MF5
Now obviously once Forza 4 comes out with even more cars, GT5 is going to look even more lackluster.
Personally I'd want them to release an update with like 40-50 new cars, as well as give us an ability to race on tracks of our choice against random opponents that have the PP as the car we have chosen. Because right now the only way to do that is via practice where all competitors have the same exact car as you
2010 Acura TSX V6
2009 Alfa Romeo Mito
1971 AMC Javelin AMX
1964 Aston Martine DB5 Vantage
2009 Aston Martin DBS
2010 Aston Martin One-77
2010 Aston Martin Rapide
2010 Aston Martin V12 Vantage
2009 Audi Q7 V12 TDI
2006 Audi RS4
2010 Audi S4
2007 Audi S5
2010 Audi TT-RS
2010 Bentley Continental GT
2010 Bentley Continental SS
2010 Bertone Mantide
1971 BMW 3.0 CSL
1991 BMW M3 E30
1997 BMW M3 E36
2010 BMW M6
2009 BMW X5
2010 BMW X6M
2011 BMW z4 sDrive35is
2004 Cadillac CTS-V
2009 Cadillac CTS-V
2011 Cadillac CTS-V Coupe
2009 Chevrolet Aveo5 LT
1979 Chevrolet Camaro Z28
2005 Chevrolet Cobalt SS
1970 Chevrolet El Camino
2008 Chrysler 300C SRT-8
2004 Chrysler PT Cruiser GT
2011 Citroen DS3
1971 De Tomaso Pantera
2010 Devon GTX
1996 Dodge Stealth RT Turbo
1957 Ferrari 250
1984 Ferrari 288
1999 Ferrari 360 Modena
1991 Ferrari 512 TR
2002 Ferrari 575M Maranello
2010 Ferrari 599XX
2004 Ferrari 612 Scaglietti
2003 Ferrari Challenge Stradale
1969 Ferrari Dino 246
1994 Ferrari F355
1995 Ferrari F50
2005 Ferrari FXX
2010 Fiat Punto EVO
2009 Ford Fiesta
2010 Ford Fusion
2007 Ford Shelby GT500
1987 Ford Sierra RS500 Cosworth
1993 Ford Mustang SVT Cobra R
2010 Ford Taurus SHO
2010 Gumpert Apollo S
2010 Holden HSV w427
1999 Honda Civic SI
2006 Honda Civic SI coupe
2009 Honda Fit Sport
2004 Honda Mugen Civic Type R
2010 Honda Mugen Civic Type R
2005 Honda NSX Type R GT
2010 Hyundai Genesis Coupe
1956 Jaguar D-Type
2009 Jaguar XKR-S
2009 Jeep Grand Cherokee SRT-8
2010 Joss JT1
2010 Kia Forte Koup
2002 Koenigsegg CC8S
2008 Koenigsegg CCGT
2006 Koenigsegg CCX
1997 Lamborghini Diablo
2006 Lamborghini Miura Concept
2008 Lamborghini Reventon
2008 Land Rover Range Rover Supercharged
2006 Lexus IS350
2009 Lotus 2-Eleven
2006 Lotus Exige Cup 240
2006 Maserati GranSport
2004 Maserati MC12
2011 Mazda Mazda2
2009 Mazda Mazdaspeed3
2004 Mazda Mazdaspeed RX8
2009 Mercedes A200 Turbo
2004 Mercedes C32 AMG
2010 Mercedes CL65 AMG
2003 Mercedes CLK55 AMG
2010 Mercedes E63 AMG
2009 Mercedes ML63 AMG
2009 Mercedes SL65 AMG Black
2010 Mercedes SLK55 AMG
2010 Mercedes SLR Sterling MOss
2010 MINI Coupe
2009 MINI JCW
2010 Mitsubishi Colt Ralliart
1995 Mitsubishi Eclipse GSX
2010 Morgan Aero SS
2010 Mosler MT900S
1970 Nissan Datsun 510
1969 Nissan Fairlady Z 432
1993 Nissan GTR Mines
2007 Nissan Sentra SE-R
2009 Nissan Versa
2005 Panoz Esperante
2010 Peugeout RCZ
1968 Plymouht Barracuda Formula S
2002 Pontiac Firebird Trans Am
1987 Pontiac Firebird Trans AM
1973 Pontiac Firebird Trans Am
2009 Pontiac G8 GXP
2006 Pontiac Solstice
1955 Porsche 550 Spyder
1973 Porsche 911 Carerra RS
1998 Porsche 911 GT1
1995 Porsche 911 GT2
2008 Porsche 911 GT2
2004 Porsche 911 GT3
2007 Porsche 911 GT3
2007 Porsche 911 GT3 RS
2011 Porsche 911 Sport Classic
2007 Porsche 911 Turbo
1982 Porsche 911 Turbo
1970 Porsche 914
1989 Porsche 944 Turbo
1987 Porsche 959
2004 Porsche Boxster S
2010 Porsche Boxster S
2003 Porsche Carrera GT
2009 Porsche Cayenne Turbo S
2006 Porsche Cayman S
2010 Porsche Panamera Turbo
2010 Radical SR8LM
2010 Renault Megane RS250
2009 Renault Twingo Sport Cup
2010 Rossion Q1
2002 Saab 9-3 Aero
2008 Saab 9-3 Turob X
1978 Saab 99 Turbo
2000 Saleen S281
2006 Saleen S281
2008 Saleen S331
2010 Saleen S5S Raptor
2006 Saturn Ion Redline
2007 Saturn Sky Redline
2010 Seat Leon Cupra R
1965 Shelby Cobra Daytona Coupe
2010 Spada Codatronca
2010 SSC Ultimate Aero
2010 Subaru Legacy B4 2.5GT
1984 Toyota Celica Supra
2006 Vauxhall Astra VXR
2009 Vauxhall Corsa VXR
2010 Vauxhall Insignia VXR
1995 Volkswagen Corrado VR6
1992 Volkswagen Golf GTI
2010 Volkswagen Golf R
1984 Volkswagen Rabbit GTI
2009 Volkswagen Scirocco GT
2008 Touareg R50
1983 Vovo 242 Turbo EVO
2004 Volvo S60R
2010 Wiesmann GT MF5
Now obviously once Forza 4 comes out with even more cars, GT5 is going to look even more lackluster.
Personally I'd want them to release an update with like 40-50 new cars, as well as give us an ability to race on tracks of our choice against random opponents that have the PP as the car we have chosen. Because right now the only way to do that is via practice where all competitors have the same exact car as you