Best Racing Game?

Sonic and All-Stars Racing Transformed.

Burnout Revenge, to bad it's console only.

I really like the Need for Speed series...

I quite like the Flatout games by Bugbear Entertainment (there is one that was not made by them, and it's generally considered to be one of the worst games on steam, though I guess the flood of asset flips might have made it lose its title).

Burnout Paradise, NFS (old ones)

I'm not sure what you call "average system requirements," but GRID autosport is amazing, as well as the older need for speeds (don't like the newer ones), especially Most Wanted (the first one).

RACE 07

Forza Horizon and NFS Carbon/Most Wanted plus driver San Francisco

TrackMania

That will be Hello Kitty and Sanrio Friends Racing of course. Who can the beat =^.^='ness :3

Joke aside do not forget Nascar series as well as other smaller racing games like Ford racing and similar...

Track Mania 2
http://store.steampowered.com/app/7200/?snr=1_7_7_151_150_1

Need for Speed Underground 2 and Most Wanted (the old one) are the 2 best I can think of, but they're so old you can't find them anywhere. EA has promised to put a selection of their best older games on Origin, and that includes these 2, but it's gonna take time. Until then...I dunna, NFS Undercover is pretty ok. If you want something with motorcycles and ATVs that's pure arcade and not a hardcore simulation, try Nail'd.

i always liked flatout ultimate (it's more like demolition than racing), but i don't know if it works since it uses gfwl.

Ridge Racer: Unbounded
GRID 2 it's on sale
DiRT Rally
DiRT 3 non GFWL version
The CREW U dont PLAY needed u.u
for NFS Series you've to get Origin

AND if you've XBOX 360/One fu*k all these ^ go get FORZA >:D

Need For Speed series for arcade and Project Cars for semi simulation

Split/Second

GTR 2 FIA GT Racing Game http://store.steampowered.com/app/8790/

I wouldn't call it the best, but Street Racing Syndicate is pretty fun (sort of like a Need for Speed Underground knockoff) and its system requirements are very low due to its age. It's also been bundled a number of times so it can be obtained for very cheap, probably near-free after you account for its trading cards. Widescreen/high-res patch is on the bottom of page 1 of this thread.

DiRT Rally has been getting good reviews since its Early Access release in April. It's also one of the most graphically up to date. If you have the money, I'd say it might be worth a shot.

Assetto Corsa

Dirt 3