From a few reports, and from some logs I've looked through, I've noticed a pretty unfortunate trend involving people pushing others into or out of certain behaviors through OOC tells.
If your team's wizard is a poor wizard, that's an in-character issue, and should be treated as such. Don't send him a tell and tell him to do X, Y, or Z because it's most efficient.
This isn't World of Warcraft, nor should it be.
There have been quite a few people doing this, and it makes questing a pretty unwelcome experience when you're playing a game and someone is trying to boss you around via tell.
So, please don't do it!