No, but they are f***ing annoying, zooming around on a mount and not doing anything useful.
That is the redeeming factor of these combat mounts - players are more efficient off them. They are fun, fast and annoying, but not as efficient as a player. Not to mention that in DF, Dominion, and AoD, you have to unmount to make points for your team. I wish they made WH the same somehow, but I can't think of a way to do it well.
These mounts piss me off, but they don't break the game so much. Although, Spinner is much more annoying than the wraith.