The game that got me into cars forever.
So far, there is yet to be released a NFS game that got me as hooked up as UG2 does.
My personal favorite, and definitely one of the best racing games ever.
It's great for a more casual player, with a thrilling and hooking, easy-to-learn gameplay. However, the more "Simulator" aspects on detailed car performance tuning (suspension, transmission, etc.) makes it a very impressive game for the bit realism it had to offer for its time of release (2004).
Not to mention the great atmosphere it has, and the feels it gives.
Definitely a classic game for car guys, and a game for those who want to step into the JDM and car tuning world.