My problem is like someone said, the ads/trash mobs. Kiting those little imp buggers at around 30s in Lair of Mad dragon is hard as ****. The biggest issue is the DPS not caring enough to take them off you. Even after you write in chat :(. Oh and also, Blazing Skeleton QQ, annoying as ****.
I'd love to be a tiny half or a dwarf carrying an axe twice my size xD. Their sure to add more weapons once OB starts up and they get the big stuff out of the way.
If you havent gotten to the higher lvls you cant really say if its hard or not (30+). I got to 20 and sold all my pots for a mount so I stoped playing after I reached that goal :p, so up till 20 it was pretty easy.