Deus Ex: Invisible War is an amazing sequel to one of the best games of all time- Deus Ex. Period.
The Environment is so unique and different, that it provides the ultimate futuristic sci-fi feel. It actually provides a different "feel" than the first, which I really liked.
Is it better than it's prequel? I really can't judge which either is better or not. Both have awesome stories, with unique twists and plots. Both provide awesome augmentations, neat characters, and well done polishing.
I have never been so hooked on a game in quite a long time. I was able to beat this game in 2-3 straight days of playing. I would say it's pretty average for an FPS.
Deus Ex Invisible War stands tall next to it's brother, provides unique and innovative gameplay that was found in the original, what more could you want?
A negative is that it doesn't support 2 cores. You have to disable a core before startup, which is a pain. It's a tad-bit buggy as well. The game quality easily makes you look past these things.