Dexter Vs Game of thrones which had the worse final season?
Dexter Season 8 was a pretty terrible final season, and the end is almost comically bad. Game of Thrones was at least equal in terms of the ending quality; maybe even worse.
For me though Game of Thrones is the worst of the 2 and impacted the show negatively much more than Dexter's last season. So much of the story of Game of Thrones depended on the ending, that since it was awful in every way it killed all rewatch value.
At least with Dexter there are multiple seasons that you can treat as 'series finale'. Season 5 and 7 are both acceptable places to stop and be satisfied. Even 2 or 3 would work. Only 4 and 6 which end on cliff hangers are the only ones that you can't really stop at.
Where with Game of Thrones there is no good place to stop before the end and the end is such a unmitigated disaster there is no re-watch value now.