I like OCMs that can go a little bit deeper than "It's raining in Downtown Atlanta, time for Storm Alert!" Cantore and Seidel, as well as Stephanie Abrams seem to have the knowledge to do so. Mike Bettes is just plain cool. 8)
Dave Schwartz can leave me rolling in the floor at times. And Jen Carfagno is...well, need I elaborate any further?
Edit: I'm not saying that only the above OCMs "get it," I just feel like there are a few at The Weather Channel that lack in meteorological knowledge.