Rob Zombie's Halloween II works surprisingly well, in my opinion, as a standalone movie (I'd never in a million years argue for quality in the first one, but like you said, we're not bashing movies, so).
But the second one, damn, it's not bad at all. It's not so much about establishing backstory as it is about just making Michael Meyers a nasty motherfucker. Some really brutal kills, I like that. And I like the dark edge to Laurie, great ending.
Yeah, I know that one's VERY subjective, easy to argue against me on that, but it works for me, at least.