Or, and this is may be the case, high rated teams know what they're doing. No idea what your mmr is, judging from your inability to think rationally I'm guessing around 1600. At 2.2k+ things are very different, damage is more controllable because my teammates know what they're doing, which means that all the "overpowered" things you listed aren't really all that threatening. I don't really remember the last time me or my teammates got killed particularly fast by any of the classes you mentioned, when they pop CDs we pop defensives or CC them, it isn't hard.
At high ratings the game is far more about surviving and CC than it is about damage. It's fine that Ferals do a lot of damage, their CC is easy to stop and they don't offer much else. It's fine that DKs do a lot of damage, they don't even really have CC. It's fine that Hunters and Rogues do middle of the pack damage because they have quite a lot of CC. That's pretty much how things work. The only broken class at the moment is Ret because they do a lot of damage while also having decent CC and very strong utility with Sac/BoP. But other than that, the other classes are pretty much fine.