The first 2 seasons are slow and have so much pointless softcore porn nudity. Once you get into season 3 and beyond there are many episodes that have movie quality fight scenes and sets that make TWD look like its has a b movie budget. I finished up the last season this past season and it felt incredibly rushed since its coming to an end. The next season which is going to be 6 episodes or so I think is going to be the finale. If the show feels like it drags on at times its because it does. HBO kept waiting for the author of the books to make the last 2 books in the series and he kept saying he was almost done with one of them. But after 5 years of waiting on him HBO caught up to the books and actually had a sit down with him to get a rough outline of his upcoming books so they can finish the series as best they can. Which results in this last season feeling rushed as all hell and the finale will probably be 6 episodes of endless action to conclude the series.
Once you finish this I highly recommend Westworld. Its a better series and its only 1 season. Highly impressive.