The AI starts with more units on Emperor and up, so theoretically it helps them more. As was mentioned above, I do find the AI scouting pattern odd at times...
I would say that Raging Barbarians is much more of a detriment to AI. Sure they're a bit more aggressive towards camps now, but they still have major issues.
On the flip-side, I usually play with Strategic Balance because it helps the AI a lot, especially if their UU requires iron.