Holy crap, look at the balance on that poll. 200 votes and its that close? Not surprised to see the WD slightly behind, but its still very close.
Mind you, small sample size and all, but I feel like that better evidence that Blizzard has done an EXCELLENT job with crafting the gameplay of all of the classes than almost any anecdote given by forum-goers so far.
Me, I'll be playing monk as my main/first by far. Wave of Light build looks too much fun, and the spell effect for it is the most satisfying thing I have ever seen/heard.
I enjoyed every class (got all to 13 for the sake of trying them) but enjoyed WD the least, and probably Barbarian the most, but I'll still be going with Monk, as the final result of the monk build I want looks like too much fun to pass up.