Keith Law's trade recap was pretty complementary of the trade all the way around.
Article Link: https://theathletic.com/3467887/2022/08/01/trade-report-josh-hader-padres-brewers/
Opening paragraph:
"The Padres have been linked to everyone in the trade market, as usual, but their deal for Josh Hader feels like a surprise twice over, as it’s not the kind of player I expected them to go after, and they did it without giving up any of their top-tier prospects. This feels like a very strong trade for both sides – the Padres got a clear upgrade in their bullpen; the Brewers probably sold high on Hader, while getting a significant return that shouldn’t affect their playoff odds for 2022, and perhaps even acquired players they could use in a second trade."
Prospects involved:
"Ruiz came over from Kansas City in a trade back in 2017, never quite hit up to the expectations of his time in rookie ball, then broke out this year in Double and Triple A, hitting .333/.467/.560 with 60 steals in 69 attempts. He’s a high-contact, line-drive hitter; perhaps never a 20-homer guy but someone who could get to 40 doubles (and triples). He’s also finally found a defensive home, putting his plus speed to good use in center after he tried to play second base his first four years in the minors. He looks like an everyday guy out there."
"Gasser was San Diego’s second-round pick out of the University of Houston last year and has pitched well as a starter in High A this year, sitting 92-94 mph with a slider that flashes plus and a fringy changeup that’s too close to the fastball, resulting in some platoon split (all eight of his homers allowed have been hit by righties). He’s always been a strike-thrower and competes like a starter, so if the Brewers can help him improve the changeup or, again, find a different weapon, he has mid-rotation upside."
Synopsis:
"This seems like a very strong return for a year-plus of Hader, whether the Brewers keep all four guys or use any of them in a subsequent trade before Tuesday’s trade deadline."