We like what we like. I enjoyed the Mirror Georgiou twist and wished it had gone on longer than it did. What I didn't like was Burnham attempting to out Mirror Georgiou to the crew. That didn't make much sense to me in the context of the story at the time they set that scene. But the idea of Mirror Georgiou assuming command was a cool idea. I liked when she first stepped out of that turbolift.
I think the idea of what the Federation does or doesn't do was the point of having Mirror Georgiou pretend to be Prime Georgiou. It showed that the Federation was on the verge of defeat, or actually had been defeated (wasn't clear on that) and had been pushed to the brink. We've seen every other Trek captain, as symbolic of the Federation IMO, also be pushed to the breaking point and have to be reeled back in. Burnham started off the season being that character that went extreme so it was fitting that she be the character who pulled Starfleet back at the end of the season.
With Discovery we're looking at less evolved Starfleet officers than in the 24th century, but despite that we've seen Picard contemplate genocide against the Borg, Sisko poison a planet and abet Garak's murder of a Romulan Senator, and Janeway torture the crew of the Equinox. Comparing Discover to ENT (to which it is closer in time), we saw how dark Archer and Trip could go for example when it came to the Xindi. Even Kirk proclaimed, "let them die" when it came to the Klingons in Star Trek 6.