Just to warn some of you: Super User isn't aimed at troubleshooting game-related problems.
So in most cases questions that are being asked here (being specifically aimed at games) won't be allowed in that same form on Super User. I'd prefer if the user took the effort to generalize his question to be applicable to his computer in general, then having his gaming specific question migrated.
And as a general guideline for migrating: when in doubt, don't migrate!
This applies to most sites, where you aren't a (real) user yourself, the reason the question is asked on your sub-site is often enough indication that it isn't allowed on another (beginner mistakes aside).
So instead of migrating your own 'crap' away, either close them or if they are simply poor, don't migrate but delete them.