The tangential thing will always feel better because you make rapid progress at the start, but the real returns come from completion.
Honestly the books were hinting that Daenerys would end up the way she did in the show. The show just did it in a very hamfisted manner.
Edit: I'm amazed at Season 8's IMDb ratings. I thought the whole thing was a trash fire but the first 3 episodes - half the season - are still rated over 7.5.
https://www.imdb.com/title/tt0944947/episodes/?season=8&ref_...
From what I remember the first three were competent and engaging enough in isolation but their plot beats locked in the inevitable car crash that only the book readers and super fans saw coming. Most of the ratings were probably soon after airing so the scores don't reflect the season as a whole.