Certain things I would like to be more complex, certain things I wouldn't.

Among what you listed, I personally don't want a super dangerous open world. It's not exciting, it's tedious. "Oh, I have to walk to coerthas? It's a five minute walk, but now it's going to take twenty minutes because I have to skirt around all the lvl 90 one-shot monsters." That's not fun, it's boring.

And, Hybrids really don't work in MMOs like this. You can't be a "jack of all trades" - because no matter what you're doing, you're going to be supplanted by someone better, and no one will take you. If you have a DPS/healer hybrid, it's just going to be replaced with a regular DPS that deals more damage, unless you tune fights around it, in which case it becomes absolutely mandatory and starts shunting other people out of the way.