I'd go B+ overall.
Part of this is because neither Jarvis or Severino were among the guys I was terribly high on (I think I had both somewhere between 28-35. Not exactly sure why with Jarvis. With Severino, though, in large part it is the walk rate. Even guys like Chourio and Quero, who have managed to increase their walk rate this year in season, walked in short-season ball, where the pitchers are at their wildest. That Severino didn't makes me question if he ever will. It's the reason why for all the power he was never even a league average hitter during his time in the Brewers' organization. And while in time he might be able to become a competent 3rd baseman or right fielder, he's unlikely to provide plus defensive value at a premium position like low-walk all-star types Javier Baez (at his peak) or Adam Jones. So what does that leave for best-case-scenario comps if he can't improve the walk rate much? A somewhat more athletic Mark Trumbo or Jake Burger?
I'd put Blalock and McKendry for Jarvis and Severino as roughly even. That means value wise, we got a couple of league average bats for an impending minor league free agent and a guy who very well might have already played his last game for the Brewers even if they didn't trade him.
I'm slightly more mixed on the Chafin-Strz deal, but years of control for a non-closer type reliever are probably less valuable than just about any other position, so I'm fine with it.
I would be interested to know what it would have taken to get Candelario (as we learned this offseason, some teams have outlier evaluations on players, so going off similar rankings is imprecise at best). No real interest in any of the other deals that went down.