PCARs is a great game if you like racing and driving. Not so good for drifting though
There are definitely some pretty major issues with it as well. The AI is very suspect. Online is amazing if you can find good rooms with clean racers, but that can be a challange. The penalty system for online can be pretty obnoxious too.
The car list is rather small, but if you like racing, there's more than enough to go around. Everything from FWD street cars to GT3 to LMP1 and F1 cars. Some of the lesser formulas are actually more fun in my opinion, stuff like Formula Rookie, F3, GP3, GT4, etc. My favourites are the classic stuff though; Historic Touring, Group A, Group 5, Group 4. I think they did a really good job with the turbo monsters from the 70s and 80s. You can actually feel the turbo. You really have to manage it and adjust your driving style.
The highlight of the game for me though, is the the track selection. It's got all the usual suspects aside from the Japanese tracks us GT folk are used to, but the gems are the more obscure tracks that you don't see in most video games. Oulten Park, Cadwell Park (this one gives me fits!!), Donnington, Oschersleben, Watkins Glen, Road America, Sonoma, Imola!!!, Zolder, Brno (if you don't know this track, learn it and lobby PD to add it to GT. It's bloody amazing, and would be killer for drifting) - they're all awesome tracks. Super challenging, but make for some great racing.
My two absolute favorites though are Classic Silverstone (1975) and Rouen Les Essart (1968 version. Track hosted the French GP until Jo Schlesser's fatal accident in '68. He went off at the high speed, downhill turn 3). I absolutely love both of these tracks. Classic Hockenheim is pretty beast too, especially in crazy powerful, low downforce cars like Group C.
I just recently got Fallout 4 and Battlefront, so I'm kind of hooked on both of those at the moment. I'd be down for jumping in a lobby with a few GTPers in PCARS though. My PSN on PS4 is Twitch_CMF.