Also, it's not like the playerbase is 100% correct all the time. Remember when they first announced Rare spawn tagging and that it would increase the health ? There was folks that said this would lead to nothing but griefing, that 3-4 people would tag the mobs and run on or stand around and do nothing. While the later might be true, it dosn't appear to be anywhere near the problem some predicted.
I do think it's odd that they didn't offer a locked in spec, which I thought they should of had to LFR at the start. Maybe their numbers shows it's not that big of a problem.