[Nerull]

My vote is definitely for the wizardslayer as the weakest kit to go through the game with. Grandmastery in weapons is not as strong as in the pnp game, and you can only magic items if they are weapons and armor. The magic resistance is nice, but it is not until ToB that it gets into the levels where it makes a huge difference. If you are able to hit a wizard, then you are disrupting his spells; the spell failure power has never been terribly advantageous in my mind, at least soloing. Now, in a party, this allows you to switch opponents after a few hits, leaving the mage vulnerable due to spell casting failure. But is still a hard ride anyway.