DVOA is a useful tool to quantify these kind of differences because is based on actual measurements of performance contribution to wins and losses -- so you can compare kickers to (say) QB's.
Just looking at the FG/XP game (i.e. ignoring kickoffs) for 2022, there's a +10% to -10% DVOA difference between the best kicker and the worst kicker.
The DVOA range for QB's in 2022 was +30% to -30%.
The difference between the best kicker and the worst kicker was 1/3 the difference between the best QB and the worst QB! That's a lot riding on one player -- especially given that QB DVOA is affected by the quality of the receivers etc while a kickers FG/XP contribution is pretty much an individual one.
Quantifying that in their model, an average team will win 1.5 more games by upgrading to the best kicker and lose 1.5 more games downgrading to the worst kicker.
If you can truly identify a great kicker in the draft, it looks like it makes a ton of sense to spend a mid round pick on him.
Caveat: I only looked at 2022. A thorough analysis would look at multiple years particularly to see how much of the FG/XP DVOA variation was skill and how much was noise.
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