Lvl 50 almost through Nightmare, once you get past normal shit gets real, before then it really doesnt matter what skills you use, you can get through autoshooting.

So in later difficulties I tend to like escapability with efficient usage of disc, huge aoe shooting with efficiency again and a slow down skill. Seems very lame like a 10 year old wrote it, long day at work. Anyway, the skills i have slotted are the hungering arrow with either increased pierce or fire rune, then have cold elemental arrow, then jump dodge, then multishot with increased damage or the cheap cast cost rune, then preparation with the 60% heal rune and my last slot is random (usually have the dmg trap).

I find so many skill useless or a waste of hatred and for the later difficulties your goal is to be out of melee range. So usually going to multishot first then elemental arrow and kite most groups using click move then click elemental arrow until they are all close enough to be multishotted. Bosses all I do is elemental arrow and damage traps and keep my jump backflip disc skill thing up.

There are so many ways to play this class, a lot of ways which are also viable end game builds. Just play through and find what you like most.