Here's how I like to measure a defense. How did it do against each opponent compared to how that opponent did on average for the season.
This season the results are more telling than usual because everyone played only SEC competition. My preferred stat is yards per play - because it takes into account tempo for teams that run more plays by design.
Mizzou held five of its 10 opponents under their season average for yards per play: Alabama, Florida, South Carolina, Kentucky and Vanderbilt.
That also means Mizzou allowed five of its 10 opponents to average more yards per play than its season average: Georgia, Arkansas, LSU, Tennessee, and Mississippi State. Three of those games were MU's last three games when the secondary was especially depleted. Not an excuse, but a valid factor.
Mizzou also held five of its 10 opponents under their scoring average for the season: Alabama, Florida, South Carolina, Kentucky and Vanderbilt. And Mizzou allowed five of its 10 opponents to score more than their average points per game: Georgia, Arkansas, LSU, Tennessee and Mississippi State.
It's the same five games for both stats. That tells me this was an average Mizzou defense. Good some weeks, bad some weeks. But for the year, mostly average.