I've played since TBC... As I said I very rarely seen complaining legitimately. People complaining about something because they're bad isn't legitimate. It's like now, some people say Hunters are op when they do nothing do try and counter them and use no defensives, so they get owned and come to complain when really it's just them. Then you get proper complaints about Hunters being able to counter everything you do and killing you whilst your partner(s) are in CC through defensives etc (example).
PvP now is a million times worse than Wrath, and some classes aren't viable at all when in you had much more of a choice.