Excellent. Although the ending went a bit over the top and at times felt more like fighting the final boss in a very cinematic video game, I really liked it. Definitely one of my favourite films.
One thing that bothered me, however, was how they neglected to resolve the whole thing about the ... antagonists I guess? Considering they were doing this entire experiment because they wanted to be like humans, I feel like there was a moral issue in there that could have been discussed more throughout the film.
It was amazing all the same, though. Very interesting story and the characters were pretty cool, most of them.

Kiefer Sutherland's acting in this movie is just ridiculous..

This move was amazing... It had everything in it, I just couldn't stop watching it, and it left me just sitting here in my chair for minutes after...