Graphics: 4.5/5 One of the best looking XBLA games to date. It looks like the Spongebob games on the PS2; maybe a bit blander. Runs smooth most of the time, but the occasional hiccup can be frustrating and screw you over.
Sound: 3/5 At first it wasn't bad, but the characters constantly repeat themselves. The three levels all do have good background music, though. It sounds like the Mermain Man and Barnacle Boy theme for the Krusty Krab levels for instance.
Control: 3/5 Frustrating as all hell. Several times when I'd go to jump, I'd body slam. The hitting system seems broken, as I get what appears to be a direct hit on a jellyfish, and I randomly miss.
Fun: 3.75/5 Well, is it worth it? Probably not. For a huge Spongebob fan, or a little kid, this game would be great. For $10 you're getting a game you can actually "beat" in a day. However, if you want the achievements, you have to play three levels. Six times or more. To get all the achievements. Is it really worth it? SpongeBob UnderPants is a pretty decent game, a big surprise, but not really worth the 800 MSP.