For me the game represents 10% of the fun and the cars and tracks are there to enable the other 90% to happen which is online racing with clean, high quality drivers.
There are many good online series to choose from and you don't have to be fast to find one (or several) that you enjoy. I can personally recommend ones by:
@FergusMik,
@gkgamer,
@SmileyWRX,
@Cu3e,
@JockeP22 and the GTP Geezer Club (for Geezers over 60 years old).
Different people enjoy different aspects, but for me the fun is in finding groups of cars which can race together to recreate great race series from the past - sometimes using substitute cars (where the originals are not in the game). Testing those cars, planning then hosting a series and seeing the great photos that the racers post here on GTPlanet. Who would have thought that a Mini, Buick Special and Renault 8 Gordini could have such similar performance and produce such great racing and recreate the spirit of early British Saloon Car Championship Racing.
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I'm running twelve race series this year - this is one example - a recreation using substitute cars for the ones which competed at Le Mans in 1966:
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Everyone remembers Ford's 1, 2, 3 with the Ford GT40 7 litre MK2, but not so many remember Porsche's 4, 5. 6 and 7 with their white painted 2 litre 906 / 6's.
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For me, you get as much out of the game as you put in and if you have good friends and good online series to race in you will have fun!