Sneak King - not that great, the camera is really hard to control and when you surprise people with food, their reaction is not that great.
Pocket Bike Racer - is pretty good, its like a lesser version of mario kart but with big jumps, pretty neat power ups. Havent been able to figure out how to do wheelies, but this one looks like it will be fun online.
Big Bumpin' - by far my favorite, its a few minigames in a bumper car like hockey, hot potato and others I haven't tried out. The mini games remind me of what you see on Mario Party or Fuzion Frenzy, very fun games.
I was very impressed by the graphics on all 3 games, they actually look a lot better than some of last years ports. They are totally worth it, well maybe except for sneak king but other than that they are pretty awesome.