I agree with this. Tom Jackson on ESPN (met him here in Cincy once, super nice guy) said on NFL Countdown that morning of the Titans game, "The winner of this game will be in the Super Bowl." He was right.
OP topic, most disappointing season? Geez.......it's like a Rolodex when you're a Bills fan. For me, I think it's gotta be a tie between 2004 and 2011, with 2003 honorable mention. Bledsoe played arguably his worst game ever against Pittsburgh's backups (and we were at home!); The fool's gold of Fitzy in 2011; 2-0 start (remember James Hardy in Jacksonville, RIP) and it just bailing out after then.