You're really fucking dense, aren't you ? Your CC is nothing but a cooldown to you, only other class that has the luxury of being a fucking moron and have his instant on-demand CC usable anytime is a fucking Warrior ( which is why two moron classes fit so well with each other in current expansion ). Last time I checked, Mages do indeed have the ability to fake one-two interrupts and just keep casting that Polymorph like an annoying pest, and it'll eventually stick, yes. But said process can take up to 10 seconds, and during that time their pressure/kill window can fall off, and during that time they're not doing any damage.
You, on the other hand, see your stupid cooldown flash and you simply press it. It's that simple - and let's not even mention that you actually DO your retarded damage even while "going for CC".
It's truly horrifying witnessing a clueless person being unaware of how clueless he/she is.