kk again i gotta straight out ppl....
arca ez if ppl got time to do it
i did it as full epic rogue whit blue/epic druid tank epic mage blue/epic healer and blue lock
hardest heroic:
1.durnholde(hope it will be nerfed soon)
2.Black Moras(had full epic grp today we failed)
3.Shatterd Halls(you rly need CC for this instance all 3 is recomended,bosses are hard)
4.Shadow Lab(requires cc again)
5.Arca

for beginers i sugest to STH(u need at least 1 priest)
                        Ramp
                        BF(aint rly easy but it aint bad)
                        Mana Toms
                        Crypts

LOL, we one shot heroic BM everytime it is the daily. And Heroic OHB was the first heroic my holy priest ever did (well before she had any Kara gear).  You have to keep heals on Thrall too. 

Shattered Halls can make or break you.  Wanna put it on easy mode?  Take two tanks and two healers and the best dpser you can find.  Don't worry about cc.  Tank and spank it all.  The only one that isn't expendable in the group is the dpser, lol.

It's worth 5 badges if you get the execution quest inside, 7 if it is the daily.

So just because something is easy for one person doesn't make it easy for everyone.  Group make up, skill, and gear makes a huge difference.