I don't have a problem with the ease. The mobs are fairly easy to kill but the bosses do take a while. I'm sure they will be easier once we get the level 20 gear.
We have to remember this is a new game. In PL both forest haven and balefort castle are really easy. I'm sure the levels will get harder and harder as the cap continues to go up.
There's always elite mode if you want a challenge.