I like movies about time travel. In general.
But what bugs me is how time travel movies are rarely consistent. Like, I feel like a time travel movie can have one of two theories behind it:
1) Things you do when you time travel to the past change the future
2) Things you do when you time travel to the past explain the future
Either one is okay. But more likely, movies mix both. Which is just wrong.
To give a classic example everyone knows: Back to the Future. I love this movie, but it definitely mixes the two theories of time travel.
Obviously, things Marty does in the past end up changing the future: when he returns to 1985, his parents are completely different. And he has a really cool car.
But at the same time, things Marty does in the past explain the future, such as the etiology of his first name, inspiring Goldie Wilson to run for mayor, and inspiring Chuck Berry to write Johnny B Goode.
So which is it? Do Marty's actions in 1955 change the future or do they explain it?
Occasionally, a movie comes close to getting it right, or at least it's confusing enough that you're not sure. I think 12 Monkeys may have gotten it right. Ditto with The Time Travelers Wife (the book, not the movie). Also, I think Futurama did it well, if not perfect.