I think what confirmed my hated for Burnham (A character I was already hating in Seasons 1 and 2) was the Vulcan episode of S3.
Her mother "Just happens" to be on the planet (Even tho we last saw her in the future and implied she was trapped.) How lucky that magic burnham was along...no wait, magic burnham is ALWAYS along *sigh*, and JUST HAPPENS to be (apparently an important/ranking member of) a romulan religious sect they need to convince for whatever it was they wanted the vulcans/romulans to give them.
How is she there, why is she a member even tho shes like the only human, why is it somebody related to burnham out of all the entire universe? Don't know the show just wanted it to be somebody linked to magic burnham, so it is.
Ultimately they don't trust magic burnham and she doesn't get what she wan...wait, wait...no they just change their mind at the end, just because, so she does get what she wants. Apparently just because she's magic burnham.
And this seems to always be the case, where she's either force butting in to be involved in that episodes events, or other characters (whose skills rightly cause them to be suggested) back out and actually suggested burnham instead (And usually for very pathetic reasons, which break down to "the writers actually wanted magic burnham to be involved. it didn't make sense so...fuck it, here she is. Bye!")
I actually couldn't make it all the way through season 3 I quit 2 or 3 episodes before the end and I seriously doubt i'll come back to the show. (Espeically given what I've heard about the last episode)
I still; find it crazy just how little we know of what of the rest of the characters, even when it seems like characters are starting to get focus they just vanish for ages and then show back up back in their "Here I am in the background. Doing nothing. Saying nothing. Because I'm not magic burnham")
At least in, TOS for example (Which I've been watching recently on netflix) it makes sense for kirk and spock to be front and centre, being the captain and 1st officer. You don't see kirk telling spock to stay behind and grabbing some random ensign to be the episodes big damn hero, because it wouldn't make sense.
The show really needed to dial back on trying to continually hero moment burham, tho from what I see on social media, it seems like you eitehr completely buy into her character or just completely hate her character, haha.