Anyone who has never done anything but LFR and steps into Molten Core thinking it will be of similar difficulty is going to be in for a rude awakening. It’s going to be funny to watch. MC is very basic and not difficult but it is still much harder than modern WoW LFR. It requires coordination and leadership and most players knowing their roles and performing them at a minimum level of competence, none of which can be said for LFR.