The best critics know not only whether and why they like something, but also anticipate how their readers might disagree.
Case in point: the Boston Globe dinged the recent "Speed Racer" film because it never let up in its onslaught of color and action. That’s precisely why I liked the movie and was fortunate to be able to discuss this with the reviewer, Ty Burr, later on.
For music- can you see through a lackluster review to see what an artist is trying for? Again, good critics will share that. Good readers go beyond to find what they need to know. The latest Mojo Magazine, for example, paints a picture of the band Oasis in such disarray that they sabotaged their new album. That certainly influenced my opinion as much as any review.
Apply this to any media you consume. Are you a critical audience?
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I always look at critics as just someone else who has an opinion. Who’s to say whether it’s right or wrong?
The ones I tend to read more are the ones that offer a simple overview – likes, dislikes, and if they offer a “if you liked Product X then you’ll enjoy this” footer.
After all, one man’s ham is another man’s beef goulash. ;-)