I live in AMR III B, and I honestly love it. I have a triple room, and my suite-mate has a single; the four of us share 1 bathroom with a little hallway connecting our 2 rooms. I was lucky enough to get randomly assigned awesome roommates, but other people have had some roommate problems. It can honestly go either way. The housing process is very simple, and people mostly get what dorms they want, except for the people in Hopkins Inn (no one wants Hop Inn). If you want a triple, you're basically guaranteed it.
All of the dorms are pretty great! AMR 1 & 2 don't have air conditioning, though, so a lot of them spent their summer days in Wolman or AMR III for the coolness. The III's are great because we're right above the FFC!