This movie is, well obviously about space hence the name Apollo 13 and it tells the tale of a routine space mission that goes wrong. It is pretty long and definitely worth a look. The actors are brilliant, plot is good and the movie is cinematic and well paced. Tom Hanks plays the main character and he does a great job at it. Special effects are pretty good for when it was released and don't detract anything from it (as in make you wince at the sheer fakery of it, it is well done).
The special edition comes with an extra disc filled with goodys that are worth a watch. Making of, documentary type things, etc. A good buy, not an action movie but more a documentary itself, but… acted? A story based on real events. That's it. =)