I just saw Ronin again on TV. Boy, that's a wonderful movie. Good pacing, great acting, great script, and awesome car chase scenes. Great chemistry between Jean Reno and Robert DeNiro, too.
Jean Reno was in another movie I love, Leon, another classic action movie. Gary Oldman is at his manic best as the drugged up bad guy cop. Reno is marvelous to watch as the kind-hearted assassin. I won't go near the Natalie Portman aspect ;)
Great action movies explode from the screen, but also make you think a little. Good ones are entertaining, but you can switch your brain off as you watch. Give me a great action movie any day.