And I still think it's all dependent on whether or not you took Flaming Sphere as your level 1 daily (and Stinking Cloud as your level 5, if you made it that far).
Ours started with Sleep and switched to Acid Arrow. Sleep was useless; Acid Arrow rarely hits, and, if it does, it sprays any allies in the area. It's very rare for there to be two or more targets and no allies adjacent to them. The most useful spell thus far is flaming burst, because it only targets enemies -- but that requires the wizard get his low AC butt "all up in their grill".
For those who dislike wizards: do your wizard experiences typically involve people blowing all their big shots in the first round, or do they hold back most of the time?
Encounters tend to be used early, but ALL of us hold on to our dailies as long as possible. The fear that there's something nastier just around the next bend is pretty strong in our campaign. Our DM likes to play with us, of course. We had one VERY nasty fight which we held back as much as we could on, due to the knowledge that the real big bad was, indeed, just ahead; as a consequence, we staggered out of that fight in single digit hit points and many of us with no surges left. We took 5, then went, with great fear, to the "final" fight... and then steamrollered through it, burning through all of our dailies and massacring the enemies who were much weaker than what we'd just fought.