I can do the same on all other classes I've played to 50 (Madness Sorc & Annihilation Marauder respectively). In fact, I'm pretty sure it can be done with any class. No, it's not the class, instead, most enemies I meet (in PUGs) simply don't play very well. I'm not that great really, but they're just terrible.
Note that I never said that I win every battle. I said I can kill any class 1vs1, and can at times win 1vs2. What's so OP about outplaying people?