IMO energy bolt isnt THAT bad. I mean, yes it sucks but, it can be used as filling and , tbh, most wiz skills are useless exept for quick cast and magic missile.
Lethargy lvl 1 for atribute on bosses only.
Sleep > as many spare points you got, it can be useful mostly for survival.
(I would have maxed it but i spent 5 points on surespell which…I never ever again used ._. , but got it at lvl 12 and is nice)
After 1 energy bolt, 1 earthquake and maxing magic missle/quick cast…everything else is from bad to worse. I like to max reflect shield first (its numbers are minimal …but i feel it helps even if just a lil bit). Sleep is probably the most useful one in some situations (although you probably wont be using it during most of the game). Note that there’s an atribute that increases the damage of energy bolt on sleeping enemies. Yes energy bolt sucks but as i said before better than nothing when your other skills are on cooldown, so use sleep > energy bolt against those evil homing-autoattackers that hit hard as hell and have like 100000000 life.