Because I am slowly working through the prize map, I still don't have the Wizard, although I'm going to obtain him today (as I am using the shorter route). 😃
My thoughts on what I've seen about Wizard so far (from YouTube and my gameplay), I think he seems to be an excellent character. His Zee-lixir has high potential, being able to make zombies invincible while attacking, whilst preventing opponents from jumping and sprinting, and negating some of their abilities. His Spell Disaster is easy to spot, but does a lot of damage and has some homing. His Co-Star seems to have lots of potential as it makes an attached zombie (as well as wizard himself) very powerful.
His primary hits high damage at a rapid speed, and his charge up Orbacadorbra doesn't seem to be effective, unless you use it in groups of plants, in which case, it can be very powerful (only problem is a sunflower could nullify much of its power).
Wizard seems like a very cool character, I'll be sure to share more feedback once I have unlocked him later today! 🙂