Nah, imo it is not easier or better than other classes, it is simply that different classes have different functions. 2hers have a bigger damage potential than almost all other classes (cav hit less often, archers have limited ammo, shielders have reduced damage, a lot of polearms are support, etc), and that shows in the kdr the most.
A shielder can do his job and very easily have 0/3 at the end of a map, if he has been charging the first on the ladder, been the one to charge into the enemy shieldwall disrupting it while taking hits, saving the flag, etc, whereas a 2her's job is to wreak havoc with his big ass weapon. Archers and cav have different roles as well.
Certain roles for certain people. And since a lot of people like to be the hero/have a great kdr/need epeen (not all of them though), it is only normal than many people play the 2her hero (who has not dreamt of being a 1 man army taking on thousands of enemies with giantic swings of a blade) and that many people become good with it. Not OP, just its function in the team.
