Fight or Flight will get you more aggro since it'll increase the damage you make, so if it's available, use it.

Bloodbath (marauder cross class skill) will also give you a tiny extra bit of aggro with every hit since you are healing yourself.

Other than that, the above posts already explain a lot.

Green or purple weapons/gears are NOT necessarily better than HQ stuff you can buy from the market board.
For some levels, the crafted hq gear is better than the dungeon drops.