I like critics that provide a realistic and well-explained, unbiased explanation of their subject. For example, if one were too say "The guitars were too noisy and dominant" I'd probably ignore the review, whereas if they said "The guitars have an extreme level of distortion, and are mixed too highly for my liking" it'd mean a little more to me.
Of course, this isn't to say that the critic's opinion will affect my own. If possible, I will use the critic's general standpoint compared to mine to get a rough estimate of what I'll think of the subject. I guess that's a fancy way of explaining "If a Pop/Hip Hop fan gives an album a shit rating, I might not mind it".