This is an oversimplification of Bemidji. BSU can be bad, at times, but they are the bottom half team in the WCHA that none of the contenders wanted to play. The Beavers' faults? They don't score much and are not built to come from behind. After Mowat graduated, the goaltending has been inconsistent. When it's off, they can look bad. When it's on, you don't want to be the "good" team that has to play them. BSU is a team that can skate with skating teams, they'll grind all game with you, they'll block shots all over the ice, and mostly, just make it hard to play against them. The perception is that this is a team you "should" be beating, but now the third period is getting late, and they're still there.
I was chatting with Mike Sisti a few years back, after the Agosta years, but while Mercyhurst was still an NCAA Tournament team. He said something along the lines of, "Bemidji is a lot like us." A lunch pail team. Hard to play against. BSU has never had the offensive talent of the Lakers, but they've always managed to hang losses on teams that didn't want them all the same. Look back at their nonconference results over the years. Clarkson wasn't the first and won't be the last. And they do that to WCHA teams all the time, and then everyone says, "What a bad loss!"
Every league has a team like that. I'm not sure that people outside of the ECAC fully appreciate SLU. A different style team, more skill and less grind, but always dangerous. UConn seems like a team that plays better in the postseason than they do for much of the year (I imagine I just jinxed the Huskies vs BU today).
Overall, I think that the distance between good teams and bad teams is getting smaller. The ECAC's best could play with the best of the WCHA; I realize that. I've known writers from the East who believed that one of the WCHA's advantages in the postseason was that they were accustomed to playing two-game series against contenders. That would seem to be counterintuitive, given the NCAA Tournament doesn't require this. However, they've kicked the hornets nest in the first game on a Friday, and then had to play that same team on Saturday -- "They're mad now!" You learn quickly where the weak spots are in your game. Something might work if you always play with a lead; it's not as effective if you're down two goals before the fans settle into their seats. Clarkson proved that either schedule model can produce championships, but it is at least something to think about.