Who are some promising directors and actors that you thought were going to make it big, but ended up disappointing you?

For me it was Neil blomkamp. Expected some awesome movies from him, but nothing reached the level of District 9. Elysium was a good try tho. Oats studio was just disastrous, except for Rakka.

Then, there's Aaron Paul. I guess he did make it big with Breaking bad, but I thought he was going to become a major actor in Hollywood after that. Instead he made some bad choices and now his only other known role is in Westworld, another show.

Edit: He also has a notable role in Bojack horseman, which is another show.