https://www.footballoutsiders.com/stat-analysis/2018/2017-dvoa-routes-quarterbacks
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One caveat is that this can change year-to-year (see Alex Smith). There are multiple things going into why a QB is accurate (or innacurate) on a route beyond the QB himself - including personnel, play calls, what defences are doing that season, etc.
1) Winston was very bad YAC on curl routes. Likely largely related to his short game innacuracy, long windup, and Evans poor YAC performance (Evans was one of the worst WRs on curls routes among qualifying WRs).
But his performance on curls was slightly above average (just wasn't generating YAC). 71 passes thrown.
2) Unsurprisingly, we see Winston have success on Outs (54 passes) which is often a more intermediate route. Plays to his strength.
3) Average on digs (39 passes) and slants (30 passes). I'd expect him to be better on digs but slans are short, accurate throws are not Winston's strong suit.
4) Only through 9 drags last year after throwing 28 in 2016 (and having success with them). Never through a drag to Jackson which is weird. Still a successful route in 2017, just rarely ran.
5) Deep passing is worse than we thought. Worst in the NFL on go/fly routes (2016 was almost as bad). 2017 Winston only connected on 13.6% of Go routes. He was 1/6 in targeting Jackson (with a 7th PI) and 0/8 on targeting Evans. "if Winston can't start hitting the broad side of a barn with these deep throws, then it's going to be a disappointing offense again."
It's more of an intermediate route, but Winston was also very poor on the fade (16 passes).
6) Interestingly, Winston was GREAT on posts, generating the best performance (27 passes) in the NFL. This was primarily on throws to Evans. Funny enough, Mariota was also excellent with the post and both Winston and Mariota were also great on these routes in 2016.
Winston was also very good on the seam route (19 passes).
7) And funny enough, Winston and Mariota were also tops on Comeback routes (although not thrown often, Winston had 10 passes).
8) Lastly, we see that Winston was only average on broken plays. This makes sense because for every crazy completion to Evans, there's something boneheaded.
This does put a lie to the notion that Winston is a magician on broken plays (same as 2016). He's average.
Conclusion: Winston is very strong on plays he can see in front of him (posts, seams) and on deeper intermediate routes like comebacks and outs. Not sure why he wasn't better on drags as he was also below average in 2016. Other than drags, he struggles with shorter routes. And he's terrible on deeper routes to the outside like gos, flys and fades.
This has to change in 2018. You're not going to be great on every route but Winston needs to get his play up to average on Gos and Digs. He also needs to be more willing to throw drags with Djax (duh). He needs better ball placement on shorter routes to generate YAC but his WRs also need to help him out.
