It's been nerfed, I think. We 4manned it today in 1 hour and 30 minutes flat, with our 5th member ragequitting after the first room when none of us rezzed him since the waypoint was right there. The bosses felt so easy with 4 people.
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Just went through AC (story) for the first time with a group that seemed to know what they were doing. We got through each boss on the first try (some people died and ran back but we never completely wiped).
I'm not sure if I'm a fan of the way fights seem to be centered around "organized chaos"... but the dungeon itself didn't seem too bad with a good group.