The bugs on Molten have always been greatly exaggerated.
As far as PVE goes, MOST of the end-game content, and I speak mainly of RS and ICC here, is honestly very close to a Blizz-like state, and even the encounters that are less Blizz-like are still scripted such that they're very challenging in their own way (for instance LK p3 on Warmane is a good bit harder than it ever was on retail). The only 2 exceptions to that are Deathbringer Saurfang (who's basically just a patchwerk here - which makes him useful for measuring DPS), and Professor Putricide. Everything else is scripted well enough to provide a satisfying challenge, and this is evidenced by the fact that Molten has, for so long, successfully maintained the largest active WotLK private server community, a large portion of whom pug ICC/RS regularly and enjoy it.
That TOC and Ulduar right now need work goes without saying, but that's part of why Lordaeron is so hyped :D.