haha, those are my two favorite 360 games too.
yeah, Nuts and Bolts is really good. First game I got all the achievements for (until they put out dlc

). It has problems but it is one of those games that really deserved a sequel because the core idea behind the game is so much fun. You basically build vehicles to complete various objectives. The problems was that the objectives often just races or didn't require you to get creative with your vehicles. A sequel with more objectives that has puzzle solutions instead of using the same strong racing vehicle would have been perfect.
Between all the racing objective sand multiplayer, it seems like they thought racing was the strongest part of their game. For me it was just building and messing around with vehicles that was a lot of fun.
and I still say that Blast Corps 2 and Nuts and Bolts 2 should be the same thing. Build vehicles to destroy shit. Fuck Banjo (not in the way Nintendo fans want, I mean, don't make Nuts and Bolts 2 a Banjo game.)