So yes Splosion man is an awesome game as long as you're willing to bear with the difficulty curve. Due to this, Splosion Man is a game that you really can't play for hours at a stretch but it's perfect for those in-between game sessions when all you want to is just Splode the crap out of people. It offers no multiplayer but you can replay the entire campaign in co-op with a buddy either online or on the same console.
And as an added bonus, it even ships with unlockables like avatars and a premium theme. All that for just 800 points make Splosion man a must buy. Of course, if you're still a bit hesitant you could give the demo a shot that's available on Xbox Live.