Loving Anniversary Classic. Digging Anniversary BTB. Anniversary maps are awesome. Needless to say that they're way better than Reach's. Bloom and AA's are still in Anniversary BTB (which is ridiculous), but seem to be less of a problem. Not sure if bloom was reduced. Occasional BS, still usually from Armor Lock. You better like Headlong because it's everybody else' favorite map, and it's voted in constantly.
In Anniversary Classic, there's no BS. Good maps, no AA's. Very refreshing. Not sure about bloom, though. But in both playlists, I'm finding matches pretty quickly. I'm impressed. Though, a few times the searching has gone on a little too long, so I just back out and restart the search.
Doesn't look like the leveling system has been changed at all and I don't believe there was any new armor added. In campaign, there's hidden skulls and at least one terminal/video on every level. The firefight map is alright but nothing to rave about. The Marines added into the mix don't really help much, as can be expected, but I like them being there. They're comedic.
Overall I'm glad I bought it. Plan on playing it regularly and never touching Reach's matchmaking again except maybe for Living Dead.