I ended up running a dungeon twice at the same level while leveling up my GWF. There may be other factors but the run with a CW spamming repel and ice storm my total damage was almost 50% lower at the end. Trying to use an AoE power was just an exercise in futility.
I think the biggest problem with the control wizard is that nothing is really being controlled. The actual CC effects either have too short a duration or take too long to ramp up to exert any meaningful control of the battle. Survivability is fine as long as you're using teleport effectively (constantly), and running away…
I thought I had this problem. It turns out it isn't a problem, it just isn't very clear. Shield Slam and the other one that I can't remember right now are not normal at-wills. They are automatically added to your bar, replacing the other at-wills, when you hold down block. Using them doesn't cause you to leave block, so…