Biggest missed opportunities in movies

[Steelmaker]

Have you ever watched a movie and walked away thinking "man, if they had just done so in so it would've been so much better?"

What movies do you think came close but missed the mark and what would you change to fix it? Here are a couple of mine...

1.) Signs: I like this movie but what I thought would have been more interesting is if there WERE no aliens after all. What if it had actually been a movie about paranoia and how people handle it?

2.) The Dark Knight Rises: I think the sappy happy ending with Alfred seeing Bruce Wayne and Cat Woman at the café was a terrible ending. Considering the dark tone of the entire series, I thought a MUCH more fitting end would have been Bruce Wayne actually dying or at the very least, leave it completely ambiguous where we never knew for sure one way or the other.