If you want to get a sense of the zeitgeist but can only read one review, you might prefer Rene Rodriguez, whose low standard deviation from the mean review score makes him very nearly a living critical average. If you are interested in an alternative perspective, Mick LaSalle's high standard deviation places him further from the critical pack than any of these peers. Reviews from both Michael Wilmington and Marc Savlov are so regularly and respectively positive and negative that they should perhaps be taken with a grain of salt.
If you're wondering, I don't have a "favorite movie critic." I judge movies by the preview, the director, and by mentally aggregating the first five reviews I happen to read. This works well for me. If I had to go by a single source, by far it would be Variety magazine, which offers separate assessments of a movie's goodness and of its popularity with various demographics, a luxury which non-insider publications do not always have.