All recent NFS games have been shocking, frame rate is appauling so steer clear! Wait for GT5 due in Q3 (In theory) will be the boll*cks if prologue is anything to go by.
Motorstorm Pacific Rift is wicked fun for a quick boot it up, play for 10 mins kind of game, or Burnout Paradise, most others imo are not great (I've tried most)
All down to personal opinion i guess,
R