Other movies that start out great, but blow it in Act 3?
Spoilers, duh.
This movie had so much promise. Gosling puts on his "Drive" face, with excellent results, up until his death. His section of the movie was nearly perfect, with a dark, serious, under-stated tone punctuated by extreme moments of suspense. But then the rest of the movie happened, and I was like
So my question for discussion is, what other movies started out really great but then deteriorated for one reason or another?
The one that comes to my mind is I Am Legend. It started out as a really smart suspense/thriller movie. I thought the flashback scenes showing how the virus spread were really well done. And then it turned into a pile of CGI, Michael Bayesque action garbage.
What other movies out there had great promise but failed to deliver?