Having done a little bit of work on stuff like this for Fandango a long time ago I learned a little bit about their view of customers from their marketing folks.

Their average customer is a person that sees all the big blockbuster movies. They are not discerning about what they see and they are not critical viewers.

Comparing these people's reviews to the professionals on Rotten Tomatoes is a little silly. As mentioned, Fandango has no motive to reduce the ratings, the more "must see" movies there are, the more money they make.

edit having read more of this article now, I see the issue with Fandango's rounding. Pretty lame.