"From the people that know it well, they all love it. But I don't seem to have the required knowledge to understand it. I feel somehow dumb by that."

When I get this feeling, it's often because I haven't yet experienced the problems the new thing is trying to solve. Is it possible Om is an attempt to solve problems you haven't encountered?

I have no personal experience with Clojurescript (love Clojure, though), so this is just a generic comment.