The last few episodes were a slow slog where nothing much happened, but we met tons of new and utterly unmemorable characters while Cavill spent the whole time nerfed and separated from everyone important.
This series deserved better. Henry Cavill deserved better.
The worst part is that if this season had actually come to some kind of narrative conclusion and did anything worthwhile with its title character, maybe I'd have given S4 a shot even with the new lead... But I definitely won't bother now.
Absolute garbage.