I refer to pretty much every fight in there. Ony - threat problems (wand dps only
), no space problems, not enought dps at flight phase problems. Add a simple mechanic like cave in in there or even Wotlk ony version with a big mob running in there and you will have a wipefest like never before.
Ragnaros - hard as it is. Add another aoe mechanic in there durin any phase and you got a wipefest. Even as simple as Luci - add another aoe mechanic to the fight and you will have tons of wipes because people will just run out of mana (first boss, crap gear, no hp). These bosses were hard with the arsenal we got. More stuff added in there can make them even worth.