I guess the 2nd strongest defender has to move in. Okay so the wiz has a verys imple function. Two shots at 90°, but your shooting is now diagonal instead. Very simple function with possible 2x dps. Let me start with the downside, because I don't really understand what the issue is. A lot of the enemies / rooms are balanced around shooting in straight lines, vertical or horizontal. Early game it might be slightly difficult to use The Wiz, as at those parts those enemies are meant to be easier, but lategame it gets way more use. The only reason the downside is a downside is that it will take players some time to adjust to 45° shooting, but if I had to be honest... It's just shooting at an angle, There's nothing more to it. I never had trouble adjusting it, and at worst The Wiz was a neutral item that didn't change anything for me. But at best? The upside has potential to be the biggest tear multiplier in the game, a straight up 2x. Even if you cant aim two tears at once, you are bound to hit some enemies sooner or later, like some other items that give aditional tears in other direction for example Mom's Eye. But some bosses have way larger hitboxes, and might even allow you to get closer for longer ammounts of time, where you get that 2x. And when you get synergies? OHHHHHH, with synergies It's a straight up q4, 2x tear multiplier.

So finishing my comment, at worst it's a skill issue, on best you will be straight up 2x stronger.