So, you don't raid, you don't play arena... you just.. i don't know, i guess you just do mythic dungeons runs and you've formed your opinion about ret capabilities entirely based on lack of cleave in mythic dungeons.
I'm a 382 SP currently and i can compete with anybody at this point, but you can grab literally random ~360 frost mage or dh from the trade chat and they're gonna do 40k dps burst by pressing 2 buttons on any pack of 4+. Do i go to my subforum and complain about the fact that some other class CAN BE more beneficial than mine under certain circumstances? No mate, it's never going to be perfect.. it's not how it works, you tweak one little thing and someone will find a way to abuse that little thing in a completely different aspect in the game and you're getting a DS buff while we're at it