I'll probably get it if it ever comes out for PC; no way am I buying an X-Box for one game, especially when I thought the first one was not terribly great. It seems that Bungie have learnt their lessons, though, so 2 should be better. I still fear for their level design, though. Marathon had some pretty shocking levels that were totally unrealistic in every way. Halo was a bit more realistic, but still terribly boring... The city level I saw in the Halo trailer looks pretty cool, so I hope they've overcome their curse.
I think the fact that I was totally spoiled for Halo didn't help when I finally played it, though. I do like a story-based game, and it's just not as good when you already know what's going to happen.