Underrated Films

What films do you think have been ignored by the general public or perhaps didn't do great when first released but later have become iconic or considered a "classic"?

I don't about any classics, as I'm not a film person, just around the media sector in general. I think Taken and Taken 2 are quite underrated. Everyone's saying they're not very good- I mean, the storyline and the action is a bit clichéd and everything although from a media point of view it is a good film. They just need to change to storyline's between films, not following the same plot.

I loved Battleship, yet that got really bad reviews