" You can't play US 360 games on a european console, right? "
You can if they're not region locked. I believe the Ghost Busters' American release wasn't region locked, but I don't see any reason Atlus would want to release a game without a region lock, when they hold the rights to publish the game in Europe themselves. We'll just have to wait, as usual.
" One of the very few things I don't like about Black Ops would have to be the guns. They're just all FAR too similar. The guns in MW2 had far more variety, and they were all worth using for different play styles and situations. "
Keep in mind, assault rifles not included, almost no two guns have access to the same attachments.