I do understand why Warriors would see getting the most out of fell cleaves to be the best option. After all this time of having pathetic damage, suddenly having a skill that could hit for 10K? Yahoo, I can finally kill things on my own!

I personally like to use unchained on my warrior for an initial pull, but that's always because I'm maintanking and want the biggest enmity possible at the start of the pull. Normally, me being the offtank or the maintank is either (a) the raid's decision, or (b) my estimation of what the PUG's other tank can handle.

I wouldn't trust a random group with something as complex as "I start in Defiance, use unchained, then maintank provokes after the pacify", since I've been yelled at for 'making things too complicated!' in the past, and don't want to deal with drama like that again.