I am level 52 and use full luck.The weapon i use is Crystal phoenix blade of nulgath which has unstable damage.With Doom aplied i do some pretty good crits,i think luck is very good cause the class has both physical and magical damage.Jut try different enhancements combinations and see what you like...
Use Luck enhancements for everything. This applies to all classes.
you can t choose luck enchancement for everything
you should use luck enchancement when your class have the:
mana regeneration ability when you crit
let s say arachnomancer/pirate/rogue some classes require theif enchancement
i did get artifact hunter today so here is my enchancement list
1/full luck for normal use
2/ 3 wizards and 1 luck in cape (soloing)
3/ 3 luck and 1 fighter in weapon ( stronger physical attacks)