After you get off the initial starting area, you can reset all stats and skills as many times as you want to for free - so you're never useless or screwed over by a bad build. Necro is quite strong - it's like a summoner/geomancer style with some party tricks and instead of armor you get life steal. The Bone Spider summon does 2x the damage of the summoner one, but it has no MR and is easily CC'd, but overall it's fairly strong in most fights.
