I posted this on official forum yesterday:
http://us.battle.net/d3/en/forum/topic/5149178540I just bought out a 90ish dps spear for my WD and instantly nightmare became normal.
Now it seems that damage is the only factor to consider for weapons, if there's a substantial increase it's a no brainer choice for upgrade, I don't even need to look at other stats, not even intelligence.
This is both stupid and unreasonable, stupid because, as said above, weapon damage becomes the sole factor, travializing all other stats, unreasonable because the sharpness of my spear shall in no way affect my spells.
World of Warcraft has the spell damange mechanics so perfect, make this game so.