I can just add to this thread that we tried Malygos 10 man last night and the fight has a serious gear check to it. We gave up quite fast. The MT was fine gear-wise with about 29K HP buffed where the raid members below 20K HP has very severe issues surviving.
With all the talks of raids being "push-overs" it could be good to have a hunch of what you need to manage difference fights. Might be good to have a "this level of raiding requires…". To start tank Naxx you should prob. be at defence 540 and around 21K HP and armor unbuffed as a warrior.