Not sure what game people have been playing when they confidently say things like this. There's a difference between being a viable class and being a top class. Warlocks, if any class, have always been viable. They have had their moments of being really strong, but it was always something different that was making them so strong. SL/SL, Chaos Bolt/Conflag, and Demo double Chaos wave were some of their stronger times. Frost Mages have been viable for most seasons. Yeah, they do high burst and have good survivability, but that doesn't mean they need to be nerfed. Frost has always been able to be dealt with. There have definitely been times where I die to one where I'm really frustrated because he Ice Lanced me for "X" number 3 times and I died, but every single class has annoying things like that (doesn't mean any of it needs to be changed). Case and point: Mages are not out of line. Improved Counterspell had to be dealt with, yes, but not with the removal of it. Reduce the duration of Imp CS to 3 seconds, and increase the cooldown of Counterspell to 24 seconds. Spell Lock was fine.
This is really ugly to even reply to. First of all, I don't agree with the first statement. There has been so many different control abilities added to MoP that Mages previous dominance in CC is being challenged. Druids, Mages, Priests, Paladins, Warriors, and Warlocks all bring plenty of control. I couldn't tell you which one is the strongest. Strongest damage? I mean, with Nether Tempest, their damage is consistently pretty high - sure, but I'm much more scared of other classes' damage.
It seems you're trying to say that deep-->blanket is unfair and shouldn't be possible. Yet again, where is the comparison to how other classes do things? How is Deep/blanket (both magical, mind you) any different from Warbringer-->Shockwave, Beam-->Vortex, Psychic Horror-->Silence, Garrote-->Kidney, Intimidation Stun-->Silencing Shot, Strangulate-->Gnaw Stun?