I know right, haha. I was very confused at first too, since he only seems to stream Frostwolf. I do like his content though and he's very positive, which is very nice to see.
Boomies are truly a beast of a class/spec in MoP. Everything about them, from stat optimization, to rotation, to the decision on when to cyclone is excellent in MoP. What blows me away by the class design of Balance is just how complex and fun it is to constantly be learning. I definitely have a long way to go with the spec, but my goodness, it is just so fun even when you lose as a boomie. There is always something you know you could have done differently.
Sorry for going off topic though, I'm obviously very passionate about that spec in particular. Fire mages are another spec that is very different and very fun in MoP compared to older expansions.
On topic, if you do want to have some very dynamic classes, MoP is likely the best choice. Yes, there is a lot of CC, but that just means PvP is more about CC'ing rather than just whoever outputs the most damage in a game.