I bought the game for 360 off my friend for 40 bucks, I wasn't planning on buying it but I figured for 40 why not, if I dont like it I can probably break even at gamestop.
This is game is straight up generic Sci-Fi FPS with RPG elements built in. It gives me the same feeling as playing a nameless MMORPG.
I'm also not feeling that kind of humorous clever heartwarming Bungie vibe I felt in the Halos. 
Not to invalidate my opinion so far, but I've only played for a couple hours, I'm going to play out my money's worth so I'll see if my thoughts change...