I liked reach, The campaign was fantastic.
I liked but didn't like bloom. Bloom was a good feature which, in halo 4 looks great, it just seemed in halo reach it was too much and it seemed to take the skill element out and featured mroe luck, 85% bloom is good, but i always preferred ZB.
Again, like Mystic said, i had no trouble with the armor lock at all, hell, i think i had more trouble with Jetpack then Armor lock, and i love jetpack. The MP was fantastic IMO, just too many grey maps, kind of felt the same and repetitive after a while.