Knock Off looks to be bs but we will have to see. Gothitelle seems even more annoying/broken cos it can just trick shit if mega stones didnt existing and just no skill the fuck out of you. Infact Trick in general too.
Anyway most megas are ridiculous so this pleases me. Their stats are basically that of a psuedo uber pokemon and i dare say they are only ou on the premise they share the same name as Ou and below pokemon. They often have better typing, stats and movepool and abilities than that of ubers. Take Mega metagross for example a 700BST pokemon allowed in OU. Idc that it wasnt banned, but just seriously think about that 700bst and its movepool and abilities. In gen 4 or 5 this thing would have been quick banned never mind suspected and to think mega pokemon like this are now the "norm" and acceptable in ou speaks volumes about the insane power creep which imo is not healthy for balance. Im really looking forward to laddering in this metagame anyway (i havent laddered properly since BW because of the power creep) and imo strives towards a balanced metagame that doesnt force team match ups. Its a great decision and takes into account what most people want in a metagame and i like the fact they can choose which one to play.