IMHO, wizards are tied with monk for 2nd worst class in the game, with crusader winning worst.
All the wizard builds that have very high dps require them being immobile, except for Wand of Woh fire build.
All the wizard gear sets are shit in comparison to other classes. People think Tal Rashas is the bees knees, but its. Even under perfect circumstances the DPS from Tal Rasha is subpar compared to what other class sets enable.
Even when a wizard has as good dps or tanking as one of the other classes, they still clear a map slower on T4-6, unless they use wand of woh build, because they need to go immobile so often, and teleport is not as good as a movement ability.
Here is why people are confused. Most of the wizard builds have very low gear requirements to enable, and those builds are very effective at t1 with this low level of gear. Other classes gear requirements are much, much higher in order to enable them to get to this level of base Wizard. However, the other classes ceiling is much higher, and they honestly do have the same amount of builds as wizard, just gated behind multiple pieces of extremely rare gear.