so far (only 7 critics have given their review, but a 39/100 average is not a good start.

Check out what these major critics have said about the film (scroll down to read their comments and score of the film): http://www.metacritic.com/film/titles/derailed

Well, let's wait and judge by ourselves.

movies that get trashed by critics are usually not liked by the majority of people.

"Usually" and "always" are two different words, aren't they?

most of the time then. Anyway, it's rating just went up to 42/100 (which means average to mixed reviews).

People who listen to critics should start forming their own opinions for once. AKA, the majority of America.

You should use the critics as a guide but that's about it.