I've been on both sides of this. Whiteboard interviews are good for a couple of things: Can the candidate explain a problem on a whiteboard? Is his hand-writing legible?

It's not sufficient to decide if someone can code. You want some actual code written by that person.

And you don't need everyone on your team being able to explain things well on a whiteboard. Just try to figure out how they are thinking and how they are approaching a problem.