Well first of all the recast is untouched and the cast time is 1.2 seconds so that leaves 1.2 seconds of time for oGCDs. Also, Barrage doesn't affect auto attacks anymore, it makes your next weapon skill hit 3 times so you can do a triple crit for 6k. So yes, WM truely does add to damage, not a full 30%, but more along the lines of 17% which is a number I heard on the forums with no source to it