I think we can all agree that Dragon Age II did not deserve to be called Dragon Age II. Instant comparisons were drawn between it and the vastly superior Dragon Age: Origins. Hence the terrible user reviews for it on Metacritic.
Metacritic user ratings are the ramblings of butthurt lunatics. Not just DA2, but game after game you'll find poster after poster giving whatever game 0-out-of-10 and rambling justifications over relatively trivial issues. DA2 has endless people giving it 0, 1, 2, or 3 out of 10. That's just butthurt crybabies crying butthuredly. The critic reviews were more fair. DAO got 85% ish, DA2 got 80% ish.
If you want high quality user reviews, your place should be GameFAQs.
Mac Version? 9/10
PC Version? Three under 5/10, six at 6/10, Twelve at 7 and 8 / 10, and a couple of 9/10s.
PS3 Version? Mostly 7 and 8/10, a couple of 5s and a couple of 9 and 10s.
Xbox 360 Version? Mainly 7, 8 and 9 / 10. A couple of lower ones.
Metacritic is excellent for a summary of professional reviews, but for the user reviews it is a cesspit.