The thing about Boise is when they were getting all the recognition a few years ago, they were blowing out everyone - from 2008 - 2011 there were only a handful of games that they won by less than two scores. Many games were 40+ to <20. Think about what they actually accomplished from 2008 - 2011: a record of 50-3, with an average score of 42 - 15. Those three losses were to #14 TCU by 1 point, at #11 Nevada by 3 points, and #7 TCU in a BCS bowl by 1 point. Meanwhile they had wins over #19 Georgia by 14, #16 Virginia Tech by 3, #11 Oregon by 11, #6 TCU by 7 and #10 Oregon by 13. That is absolutely an elite resume in my mind even with the "weak" conference schedule. I can't imagine that the blue bloods of college football would have fared any better against the same schedule over that stretch.
In 2012 they still went 11-2, but the two losses were to unranked teams and their victories were much more competitive games in a Mountain West conference that no longer included TCU, BYU or Utah (but they have played BYU the past couple years in non-con). Then last year was the first time in a long time that they failed to get double digit wins, going 8-5 and getting blown out against #25 Washington. While conference realignment has probably had some effect, I think they've faded from national consciousness because they just aren't nearly as good as they used to be.