IF the Bills lost a good game to the Chiefs then I think this season is a success. The bust part is hard for me to get my head around.
Even when you're favored and you spend a bunch of capital on your roster....SBs are HARD.
Get a respected roster, get your team to compete, get them to do it in a way to engender respect from the rest of the league, have a locker room of players who generally perform week in and week out, and have competent game plans/play calling...that's all I ask for. And if that's losing in the WC or not even making the WC...I can't call that a bust. Mostly because if you DO do those things, you'll be in the playoffs, competing straight up against a bunch of other really well run teams