Ok, maybe not yet, since I haven't hit Naxx on live yet, nor have I done the Old Kingdom and Halls of Stone (wtb group pst), however the other 10 Heroics have just flown by, I have chalked up over 100 heroic badges already, the game simply isn't a challenge.
I think a lot of this is the gear level, the difference between Epic T5/6 gear (ILevel 160ish) and the gear we are supposed to run heroics in (ILevel 187 blues) is too low, instead of them being a challenge as they were to the 10,000 health crittable tank, we are well outside the easily killable range and instead in the "if we don't do anything silly" range.
I think this was a major flaw in Blizzards plan, the very fact that most level 80s consider the correct step to be ding, go heroic is the wrong attitude, we used to have to work to get there (D3 set at the minimum really for tanks), instead now the gear is good enough.
Fixing this one was easy for them though, have the game another tier higher, and set the Heroics at the iLevel 213 state, with Naxx at 226 and 239, that would make them able to assume much more gear (and no stupid paladins aoe tanking the whole place) allowing heroics to be harder. While we don't want to see MGT again (bring 2 CC on third boss or don't pass go), we would love to see some "omg, I would like some cc now please" moments.