I found Black to be a fantastic game when I played it. How it looks, the way they restricted Pokemon to only the Unova ones, the fact is actually had a bit of a story... Oh, it was so much fun.
That said, I probably won't pick up Black or White 2. There really doesn't seem much that interests me... well, supposedly a continuation of the story, but that's not enough for me to plunk down $40. And while it's not a major deal, I'm a little sad it's not a 3DS game, even if it does have special features.
Like jcalder, I'll wait until it goes down in price... but then again, who are we kidding? Pokemon games never drop in price... I still see the Gen III games going for the same price they'd go for years ago!