Performance issues combined with poor handling and poor ported PC version.
Undercover however falls short in every possible way from NFSU2 or even MW, it seems that EA is in "bleeding mode" no matter what mr. Riccitello is saying in public.
The most disapointing single thing however is the poor port and poor performance, if my FPS is ~80-100 most of the time it still manages to drop it under 10 occasionaly and have severe slowdowns while playing making the bad handling cars even worse to drive.
The promised movie feeling is lost straight from the start when the game just kinda throws you "undercover" into a car after 5 second "movie like intro" that doesnt explain anything and doesnt give you reason to start racing (other than you need to get undercover...)
Oh the huge map would be one of the positive things but wait....
You dont have GPS! oh yes you have "gps map" (wich is poor one colored mess) but you cant add markers and pressing tab takes you to nearest race no matter if it would be in the other side of the map, so that kills the "open world" idea pretty much.
To be honest i dont have any good things to say about this game even while im trying very hard. Your better of getting Race Driver Grid wich aint badly ported and has nice handling in cars and it actually looks pretty damn good without performance issues.