Drafting a QB this year is just dumb. The QB position in this draft is incredibly weak as both Sanchez and Freeman are overrated. In an average year there is no way Freeman is even mentioned as a first round pick.
Unfortunately this season is going to be very tough for the Broncos. QB is going to be an issue and so will the defense regardless of who they draft. And given their incredibly tough schedule I think there is only a 25% chance of them finishing at .500. I think they are looking at a top ten pick next year.
Give McDaniels a year to see what he can do with Orton and Simms. I doubt it will be much (3500 yards maybe??), but I think either QB will be serviceable for a year.
And given the QB crop for next years draft (Tebow, Bradford, McCoy among others) they should wait and draft a QB then (Chicago might not do that well either as they have some serious holes to fill with no draft picks).
Stay the plan and address the defense early and often. The lone offensive position I wouldn't be opposed to addressing in the first three rounds is WR given the issues with Marshall.