I have noticed that most of the successfull programs have about 50% of their players being 4 or 5 star players, and most of the rest 3 stars. Alot of teams that drop below that seem to not be legit contenders year in and year out. A 4 or 5 star player has more POTNETIAL or UPSIDE than a lower ranked player. Teams that have alot of 2 stars or nearly no 4 and 5 star players always struggle. See Vandy, Miss State, and Kentucky.
As for Boise, it is easy for a weak team in a weak conference to get up for a big team once or twice a year. If they have to do it week in and week out they will start getting beat. Boise has great coaches, no doubt, but throw all those 2 star players into a legit conference and they would get swallowed up quickly because of lack of tallent.