I'm a Protection Warrior currently steam-rolling through each and every Heroic Dungeon without any problem as of right now. Nothing more than 337 Average Item Level and even 2-3 DPS items equipped. Heroics are completely fine as they are right now, some bosses might be challenging to certain players but once you get a group together with good players, not necessarily with awesome gear, but with brains. The heroics all of the sudden turn rather simple.
The problem in most groups atm is people not communicating before bosses, not going through tactics correctly, and generally trash-players whom have low skill, not necessarily the healer or tank, but dps that take damage-income for granted.
It has simply become more important for each part of a group to do their best, push the best numbers while simultainiously avoiding stuff and positioning correctly. Nothing more to it.