Meh. Matt Walsh is trolling for outrage clicks. That's what pays his bills.
Guns for hire was not the best episode of Season 3, sure. It's kind of a filler episode (which every season of the Mandolorian has. Hell season 2 had a filler spin off series) it's still a decent show over all.
Yes, the return to Mandolore arc is bringing Bo Katan to the front, because she's the heir apparent to lead Mandolore, and they are trying this time period into the Thrawn trilogy. She's not taking over the show though, IMO.
It's also been pretty satisfying seeing Grogu start his training and get a little more personality. That was the real shame of Lizzo's cameo, is they reduced him back down to a puppet.
Is Star Wars the best writing on TV? No. Did Disney *expletive deleted*ck up the sequel trilogy? Yes. But overall the Mandolorian is still an enjoyable space-western serial.
If you enjoyed Seasons 1, 2, and 2.5, then don't let the doomscrollers turn you off of three. It's much of the same. There are definitely ups and downs in the episode quality, but the are all decent enough to eat some popcorn and watch.