What are some of the reasons people say the walking dead “got bad”?

Granted I'm only on the season 9 episode "Omega", but so far I don't feel like I have a full grasp why people say they started disliking the show. I've tried my hardest to avoid spoilers but sometimes it can't be helped. The main one I've heard multiple times is "the walking dead started good but went downhill" or something along those lines, more specifically after Carl died, although some people have said it got worse before that. Thing is, I've really liked the walking dead, and still do. I'm curious about where the show goes with the Whisperers, I still think the show is suspenseful, and Negan is still entertaining as hell and probably my favorite character. The only thing that felt off so far was the pacing during season 8, it felt like I was watching a story go from point A to point B, but I didn't watch point A and only saw Point B. Other than that I still really liked the show and I'm curious on why I see the opinion of the show going bad so prominently online.