BTW, I LOVED Big Bumpin', but hated Sneak King. I was actually offended that they treated The King's creapiness with such offhanded disrespect.
The Big Bumpin' intro is the most creepy thing ever, and the games themselves are simply a BLAST to play, especially if you're playing multiplayer over the same box. The controls are FANTASTIC, the games are just really, really, really fun. The graphics are fantastic, too.
If you hated Fuzion Frenzy, don't worry, these games are WAY better.
MUCH better than most any XBL arcade game, and much cheaper to boot.
I don't have Pocketbike Racer yet, so I can't speak for it.