Concerning the recent discovery of Diablo III players figuring out how to be pretty much invincible in the Wizard class, it seems as though Blizzard is already on the ball to rolling out a hotfix for the problem.
We are currently rolling out a hotfix for a recent bug regarding invulnerable Wizards. We will continue to carefully monitor this issue and welcome anyone with information about bugs or hacks to submit a detailed report to our Hacks Team by emailing email@example.com, or by completing the Hacks Report web form. In your correspondence, please include any steps necessary to replicate the issue as well as any additional details you are able to provide.
While I’m sure it was fun while it lasted for those that got to try it out, it really wouldn’t be fair to other class players. Or if the situation got to the point where everyone only played Wizard because they could be invincible - where would the challenge be?
Glad to see that Blizzard is (speedily) already taking care of it though.