The Godfather one is also wrong. Sure, Part 3 wasn't as good as either Part 1 or Part 2, not by some margin. But to suggest it was utter garbage/not even 5% as good or whatever, is gross exaggeration IMO.
Personally, I thought the finale and conclusion to that film was horrific - I'll never forget Al Pacino's wretched, protracted, agonised scream at the death of his daughter. As a father to two girls, that'll stay with me forever.