I used to notice something similar when I'd play billiards. Sober I'd over-analyze every shot, and be too stiff. After a few beers I'd loosen up, play more relaxed and go with my gut instincts more. Improved my game considerably. However, past a certain point, it'd get to be a detriment as balance, co-ordination and depth perception got affected, and then I'd be worse than I was sober
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EQ is probably the same way in certain respects. Depending on the class you play and the dynamic of what you are doing, the relaxation effect of a 'good buzz' could definitely improve someone's game. Players that are relaxed and not all freaked out by imperfection (extra mobs in the pull, non-ideal class makeup, etc) do much better than ones that freak out and run for the zoneline every time things get a little crazy.