Great review Tom! PS - non-Xbox/wii owners can still play Meat Boy for free at Kongregate, which is similar but you use arrow keys and there are less levels, discoveries. Still, it's good in a pinch too.
If I were a 360 person, Super Meat Boy would sooooo be on my "get" list. As it stands, though, the GBA/DS Castlevanias will suffice.