Carlos Gomez broke down the mechanics of all the 1st round picks. His summary of Mesoraco: "From a potential point-of-view, I like the pick. There's work to do though." He thinks Mesoraco is athletic, has quick wrists, but needs to stop "lunging" after pitches.
To my mind, Devin's swing needs some work from his set position. He sets his hands directly behind (and nearly above) his head--he won't get away with that in the bigs.
BTW, he didn't like Dominguez's swing *at all*.