Wentz is interesting, because he can still be a good passer. He made a lot of nice throws even in a down season in Washington. The issues with him were playing too much hero ball and having some bad luck/play calling. Only Lamar Jackson had a higher % of accurate passes dropped last season. It felt like Wentz just lost his confidence, sometimes opting to just take sacks. Wentz didn't have any of those problems in 2021 (though he had a fumbling problem that year) and if he can even come close to that, he'd be an ideal backup.
Wentz had 2 solid games to start the season, then had a rough game against Philly, where his team did zero blocking (23 pressures) another rough game against a top Dallas D (19 pressures) then a very good game against the Titans, then a game where got hurt against the Bears where he played poorly. Not arguing he should be a starter anywhere, but as an experienced backup who can provide a spark, I see some appeal.
If Wentz is open to being a backup, he'd be an upgrade for all but a handful of teams.
Ari-McCoy (even more desirable depending on Kyler's status, could be a week 1 starter)
Bal-Huntley (now that Roman is gone, does mobility matter so much?)
Buf-Barkley
Chi-Walker
Cin-Siemian
Dal-Rush (I know he has a decent record, but they won in spite of him)
Den-Stidham
GB-Clifford (that's seriously their backup plan?)
Hou-Mills
Ind-Minshew (unlikely to return to Indy as Irsay seemed to hate Wentz)
KC-Gabbert
LAC-Stick/Duggan
LAR-Bennett
Mia-White (not impressed just because he outplayed Zach Wilson)
Min-Mullens
NE-Zappe (I might be underrating him)
NO-Winston (even more mistake prone)
NYG-Taylor
NYJ-Wilson
SF-Lance/Darnold (more confident Shanahan can fix Wentz than either of them, moot if Purdy is good for week 1)
Sea-Lock
That's 21 teams he could be an upgrade for if you are being aggressive about upgrading. The bolded are the ones that make the most sense to me, as they offer either a shot at playing time, or situations where they are contenders who are screwed if the starter goes down.
I will say, I don't think Wentz is the top FA QB, I think that's Teddy Bridgewater, who I'd add would probably be the best QB if he were in Tampa, but I think Wentz is pretty equal to Mayfield. Something like Teddy to Arizona (or Buffalo) and Wentz to Cincinnati would make a lot of sense.