Enhancement has consistently seen improvements made since I started playing them in late TBC. THe only real 'problem' you list that I agree with is the long ramp up time for the somewhat clunky aoe rotation, but you may or may not remember that we used to not really even have any AoE...so I'll take what we have over what we used to have. Could it get better? A little...but it could be a whole lot worse.
Besides out AoE (which is actually kinda powerful on the right type of packs which sadly rarely exist) I don't think we have any real pressing PvE issues. Happier atm with enhancement (pve) than any other time in the years I have played it.