I do believe that I disagree. Just for level 1 spells, I make massive use of Cone of Flame (which deals crazy high amount of damage, especially early game) and the chill spell with Foe AoE blind, alongside Slicken of course.
You should rename your thread : "Wizard is totally viable, but only because of some specific OP spells". In my party, my wiz is my #1 damage dealer (slightly above my rogue) despite the fact that it's one of my 2 main CCers.