Like anything it started strong then starts to lose it.
Here is my summary of the seasons.
1 - Great overall but I thought the CDC ending was a bit weak.
2 - Farm was good. Search for Sophia a bit dragged out with Daryl's search until you saw why they did this in the end. Also strong because you saw the loss of major characters like Shane and Dale so you know the show could go anywhere.
3 - Prison / Governor was pretty good. Coral killing his mom was strong but Rick losing his mind that bad and getting trusted again is weak. We get Michone in the beginning and lose Andrea in the end (good trade).
4 - Prison - Flu / Governor gets a tank / Welcome to Terminus - Eh. This whole season seemed more for character development with the small separated groups. But look at the flowers Lizzy was extremely memorable and showed us how hard Carol could be.
5 - Terminus, Gabriel, Corrupt Hospital, Alexandria - Eh, sliding quick. Terminus never seemed developed before it was over. Gabriel's church, eh. Hospital was not a great thread (and we lost Beth), the Alexandria with unstable Rick killing the guy as Morgan appeared seemed forced.
6 - Alexandria / Wolves and Hilltop / Savior Outpost - Bit better and getting promising. We didn't know where this was heading.
7 - Meet Negan bashing heads started strong, but by the time we got to Ezekial and the Kingdom it was going down again.