Probably best Halo game since the first, I believe... but it's still a Halo game.
I think I underestimated how sick I was of this franchise.
I definitely prefer Slayer Pro. The other game modes are very CoD-like with all their loadouts and perks. I also hate that you can vote on maps. I end up playing the same maps over and over again.
Also, the XBL party system really kills the social aspect of multi-player. There's no communication in game anymore.