Master and Commander (2003)
So despite this being a pretty mature film, it still falls under pretty light entertainment for me. It's just a pretty good 2 hour thriller. I'll give it a weak 7/10.
Most of the movie takes place on a single ship, so one thing this does is just give you an impression of what that's like. As far as I can tell, the sailing and battling tactics are all real (and yes, there are actual tactics). Also there's a ton of people on these ships; presumably you just need a lot of of manpower for everything; sailing, cooking, cleaning, firing, etc.
Random bits:
There's one guy who gets hurt in the first battle, has his arm removed in operation, and never even complains about it and he's pretty much the most badass character in the film.
There's also a guy who shoots at a bird when they're close to land, but instead he hits and almost kills the doctor. It's a bit weird that the perpetrator then just doesn't show up again. I mean yeah it may make sense not to punish him, but you'd think there'd be at least some consequences.
The music was a weird one; some parts I really liked, but at other times it felt super cheesy and I just wanted there to be no music at all. At one point, someone falls overboard but could probably still make it, but they have to let him die to ensure the ship doesn't sink. It's a good idea, but the presentation could have been more powerful, and then the music sounded so cheesy that it completely took me out of it, and in retrospect it's one of my least favorite scenes
Have someone else play the main character and change some minor stuff, and it probably could have been a strong 8.