Most great teams of the past have had to deal with major injuries along the lines. BSU has never had (I know that's not the case, but I doubt they've lost 3 starting corners/safeties in the first few weeks) to start a true frosh, unless they were a stud. They are a product of their conference. It works for them. They are good and solid, you can't dispute that. However, they are good because they aren't thrust into the same positions that a lot of BCS teams have been put under because of injuries. They are able to develop their players in a way that a lot of teams simply cannot, except for maybe the elite teams like USC, OSU and whatnot.
Playing guys that have been in the system for years will put up a good fight against teams that are overall, more athletic, but young and inexperienced (some even being prima donnas). They know their assignments and techniques and have played in front of 80k and aren't intimidated. People neglect the mental aspect of the game, but that's a large reason why they are good. They are incredibly sound in their schemes and use a lot of misdirection to help create confusion and mismatches on offense (look up smartfootball.com's analysis of BSU). That's why CU beat OU in '07 in their first true away game when a green QB (Bradford), because Hawk was certainly an idot and our two seniors (T-Wheat and Dizon) made crucial plays to prevent a loss; that, and just pure luck, which happens in football games sometimes.
They have beaten top opponents. Oregon and VT being prime example, but they also got trounced by UGA a few years back when Hawk was at the helm. They did struggle with VT though, a VT that lost to James Madison a week later, won the ACC and got annihilated by a Stanford team that played a full, tough conference schedule. I haven't seen BSU put a major hurt on a team. They win, but I've never seen a complete mauling of the other team that was a legit top 20. I want to see them play 3 top 25 teams back to back to back like KU did a few years ago.
Give them enough time and their coaches will find out how to beat anyone. They are good, unlike our last bumbling idiot coach. Give them a week to prepare for Texas, then Oklahoma then a good Mizzou or TT or fuskers and they'll have to do their homework earlier. Playing teams like NMSU (note: I went there for ugrad), I know they can already start working on a gameplan for Nevada that's out 4 weeks ago or VT over the summer. Even if you were to take a bottom team in the Big 12 last year, one with a good coach like ISU, can present upset issues. In the past few years they've beaten @fuskers and @Tejas. More so a fight than a lot of WAC teams have put up against decent BCS competition.