The jury is out on Walters as a coach, but you would be wrong to under estimating their need of a quality playmaker and what that would do to a team like the Broncos. They are a very, very good young team, that need consistent direction and purpose on the field that they aren't getting at the moment.
Do they need more then that? Yeah a few tweaks here and there, but that can be done with greater precision once you have a playmaker guiding them around out there. They need the confidence that a playmaker will give them and then you can see who is up to it and who isn't. But there aren't to many duds in that team. They just need guidance and experience.