Never rest on your laurels. When something is working, something new and improved comes along. While many of my pals prefer critics' aggregator Metacritic, which is leaner, more elegant, pickier and more pure than the mighty but messier, more inclusive and more crowded Rotten Tomatoes, there's a new kid in town: Movie Review Intelligence. It claims to add more weight to powerful critics like Roger Ebert, and boasts cool search functions (studio, genre etc), but my initial read on this is that it's designed to be studio (read advertiser) friendly.
I've written about this a lot. Truth is, lots of people look at the consensus, not the individual critics who are necessary to build the consensus. But many people do read the critics on these aggregator sites.