I already said this elsewhere, but this really is an all-time classic game. The cutscenes, the voice acting, the action, the strategy, the variety of gameplay, the missions, the story-line... It's always been utterly mystifying why the original publishers Rage didn't push this game and this franchise more, especially considering the effort that clearly went into creating such a polished game.
For those with some tech skills looking for a bit of extra playability, with the original you could poke around the saved game file in a hex editor and unlock a few extra personalities, as well as unlocking all your characters for all the missions. It's so much more fun having them all chattering in your ears from the very beginning. :)