Who actually goes to Fandango to check out movie ratings? I only go there to buy tickets.
I take IMDb ratings with a grain of salt even though I rate every movie I see there in order to get a database of all the movies I see. There are still hundreds (if not thousands of movies) I haven't rated on the site which I've seen before becoming a member there in April 2000.
I do heavily rely on Rotten Tomatoes (but only the recognized Top Critics layer of reviews and score).