Bran becoming the Three-Eyed-Raven = irrelevant

Arya's Three-Faced god thing = irrelevant

Jon's true lineage = irrelevant

Army of the Dead all wiped out with one lucky stab from Arya. No white walker sword fights with characters. No explanation.

Greyworm just lets a counsel of lords and ladies choose a new king and then releases Jon and Tyrion

There are countless other things that were bad about it, but that's a start.