I FC on my mage quite a bit and while its really good in PuGs, I would not even try to use it in premades. Its really fun to grab a flag and basically sprint it across mid when needed, but I prefer to pass it to a pally when I get there if its a stalemate.
The real advantage is you dont have to gimp yourself to FC in it. I often do in the top 2-3 for killing blows or damage and I dont have to swap any gear to FC if needed.
I run about 1600 Hps, close to 2000 with rumsy and priest buff, with 167 spellpower, but it could be more if I needed it. I just prefer not to auto die to hunters and rogues, plus I dont have a hard time killing things except some healers.
It is very very fun to be forced to blink dodge entire armies to get across mid, but I wouldnt try it if your awareness is low or if your new to it.