Boise State IS capable of beating ANY SINGULAR TEAM in ONE GAME in the playoff.
That part is true - especially if they get lucky enough a major contributor goes down for their opponent in the first-round game.
What they are not capable of doing - and their carefully crafted "let's play one team with a decent rep early" schedule - is beating 3 of those teams in a row.
If they were, you'd think they would have scheduled this by now, but they never do.
This bracket is set up as well as possible for Boise State to succeed, all the way down to Georgia being beat up in the SECCG (I spoke about that possibility at length earlier in the season).
Having said that, the best way to describe what Boise State does is they take a cheap sports car and run it at the drag strip against piece of junk cars all year and brag about how good they are. When they do finally meet a good car, they can afford the risk of running a stupid amount of nitrous and if they don't blow up the engine they have a chance of winning. The problem is you can't keep running like that.
Edit: The other aspect of this is when they finally run a into a good car, no one knows what to expect because they've been sandbagging all year. Meanwhile the good car has been pushed all year and not only does everyone know what they are capable of, but they also have more wear and tear.
The translation of this by the way to football terms if that they can afford to put all their resources, time effort, scheming into a couple games a year and gamble it all on that (kind of like Vanderbilt did to Alabama this year). Doing that over and over becomes far more difficult.