Folks are able to update their ratings - right now the frustration level is leading many to overreact and use extremely low ratings as a way of lashing out at SE - hopefully when the situation improves they'll comeback and boost their numbers. Personally I think they're entitled to their frustration, SE dropped the ball(again) - more longer duration testing in beta and specific server stress test events would have eliminated at least some of what is being experienced. The draconian server caps they're using are doing themselves more harm than good in the short term.

That said 7.3 is quite the good rating for that site for games that are not 'hit it out of the park' successes. And the sheer number of positive ratings far exceed the negative ratings for ARR.

For bad game ratings as others have said look at Diablo 3 or look at Mass Effect 3 and Simcity!