Not only is this a solid character piece and action movie, but it also laid the foundation for the next 20 Marvel movies, even overcoming the problematic Incredible Hulk that was released a month later. It showcases great action and character moments with witty dialogue that has held up very well over time. The plot with the villain is slightly more convoluted than it needs to be, and the villain himself was only good, not great. That coupled with a lack of depth beyond the scope of the film itself are all that keeps this out of the 5/5 spot.
Closest comparison: For some odd reason it works out to feel like Behind Enemy Lines by way of Mission Impossible (1996).
Setting: War
Plot: Action
Tone: Super hero