Fighting Wrathion was actually not too difficult, once I'd decided on a strat. I don't know about anyone else, but I was having flashbacks to my Rhok demons.... particularly kiting Solenar.
Back then, when it was a) a bigger deal what spec you chose and b) a bigger deal to respec, I'd stuck my guns and did the whole chain in BM spec. I had a brief moment this time around where I wondered whether I should do the same thing, but it didn't last long.
For Rhok, I had wanted to prove that it was possible to kill the demons as BM. Now, I have nothing to prove... because even if I killed Wrathion in BM spec, all I would be giving up is the convenience of a little extra AoE damage and Entrapment - I may as well just take a piece of gear off and it'd amount to about the same thing.
Plus, the game has changed. Specs are no longer what they were; people tweak talents constantly just to make a fight easier, just like Vanilla hunters changed their gear to +intellect (yes, Int. If you don't know what I'm talking about, you're new to WoW :P) to kite mobs around, or +stamina to have epic pet tanks.
Saying what spec you are as a hunter really doesn't mean much anymore - a hunter is a hunter, and people expect you to be able to do everything and have every buff pet available when required, which basically means that you need BM as one of your specs no matter what.
Since I'm Ms "BM spec since beta", I hadn't thought about it much before, but that must kinda suck for those hunters that prefer MM and Surv. I would applaud anyone who is brave enough to rock those specs and stand by their choice - it'd be the equivalent of what I did back in Vanilla, so I totally see where you're coming from!