I wouldn't say it's overblown, the Broncos are the #1 rushing team in the NFL. Willis McGahee and Lance Ball aren't world beaters or anything. Their O Line is really really good, and the threat of Tebow off the corner keeps DE's from crashing down. Having to account for the QB with a down lineman gives that good O line a numbers advantage in the running game, that is unless opposing defenses commit a safety or two in the box.
I do agree it was a dumb to have both up in OT, but Pittsburgh played that entire game like Denver wasn't good enough to beat true man to man with 3 on 3 in pass routes. That's a mistake I'm sure Belichick will not make.