>>214061772
Season 2 already nosedived, but they could keep it up as long as they could write stuff based on the first 3 books in the series, which are the best and make sort of a closed arc by themselves.
But books 4 and 5 are all about dealing with the fallout of what happened previously and setting up what's never coming, with no delivery at all.
So when they ran out of good stuff from book 3 to adapt in season 4, which had already been grossly stretched with their own filler plotlines and scenes, and had to pick from books 4 and 5, the glaring flaws Seasons 2-4 already hard were left exposed with no good plots to hide them. Quite the contrary, D&D fully embraced writing their fanfic stories for filler to make things worse.
The truth is, only S1 is truly good.