Combat engineering is a solid strategy for this game; identify which mobs are giving you trouble and shape the terrain to give you an advantage.

Got a big mob you're worried about? dig a big hole, drag the arsehole into it, you now have a giant captive arsehole that can be dealt with at your leisure. Worried about the boss for whatever reason? Build, Shape, Dig about the environment to give your self better cover or ways to disengage at will to give your self breathing room when you need it.

Fight on your terms, make them dance to your drum.