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Using KC is a great example.I think DVOA is an useful stat. Unlike ESPN's QBR for example it is well thought-out and reasoned. It has its weaknesses though. One is as @convertedpatsfan said, it apparently places too much emphasis on strength of schedule that it appears as if it's almost better playing a good team and losing bad than playing a bad team and winning good.
Another issue is that it's yardage based and hence struggling with bend-but-don't-break defenses. Let's not talk about the Pats, talk about KC's defense. They were 7th in scoring D (and 7th in points per drive). But 24th in yardage. They made up for that disparity by being the best team at taking away the ball. They rank 14th in DVOA.
Or combine both schedule and yardage and talk about San Diego's D. They rank 8th in DVOA. They had Oakland, Atlanta, New Orleans on their schedule. But in raw stats they are 29th in points allowed, 23rd in points per drive. But 13th in yards per drive. Yes, their D was put into bad field position by the offense turning the ball over so often. But a top 10 D?
I think finding a middle ground between SRS (which is points based but also incorporates strength of schedule) and DVOA is a good measure. In terms of defensive SRS the Patriots are #3 after Denver and the Giants and KC 5th. Arizona tied for 16th and San Diego tied for 28th.
If you allow yards that do not add up to points those yards do not have the same value as yards that do not add up to points.
DVOA is essentially saying, simplistically, who wins the play, and whoever wins the most plays is best. That would seem to be sensible but is not an accurate gauge of who is a better football team.