When you decide what non BYU games to watch you don't look for the worst teams. Unless you are getting paid to watch college football you have probably only seen the full games of like 15 teams or something out of how many? Like over 100? And again you probably looked for good teams and good matchups to watch when you do watch college football.
Not surprising you haven't watched a worse team this year but you can be certain that there are worse teams simply by perusing the scoreboard each week.