Well, I value the opinions of critics. You need SOME way to judge the quality of things that are coming for you cannot simply see everything there is, and any review of something is always going to be critically biased.
I always find it best just to 'calibrate' yourself to a couple of critics, in that you can always be sure where you are likely to disagree with them on something, and make use of their services accordingly.
Critics have done much to promote films that would otherwise have been ignored- for example, virtually the entire PR machine behind Memento was it's critical acclaim.