Story wise, KoTOR2 trumps KoTOR1. Hell, now that I think about it, as "the dark middle chapter of a SF trilogy", KoTOR2 trumps ME2.
And maybe I played it on PC and never had any problems, but I don't associate the game with bugs and crashes. The unfinished ending, yeah, but even with what's there? It feels like a much more complete experience than the BioWare games I've played since KoTOR1.
And you know what? There's every indication that New Vegas will be ten times the game - again, in terms of story - than Fallout 3.