Time dilation is a great and underutilized storytelling device. Far and away the best example I know of is Gunbuster. Most Western audiences don't want to sit through two and a half hours of 80s anime, regardless of the quality.
Time dilation is used to great effect in the Ender series by Orson Card, though not in the first book (Ender's Game). Highly recommend reading the rest of them if you've only read the first (or seen the movie).
I consider time dilation to be an inherently literary format, and Forever War is where the idea is turned up to eleven. There's also a short comic adaptation if you like.
