Original. How many games can claim to be that, these days? But Robinson's Requiem pulls it off... though its peculiar, voxel-like terrain may take some getting used to, along with its complex simulation of your body's health and ailments, I dare say that those who persevere, who take the time to read the manual and the white booklet from the extras section, and who are willing to learn by trial & error how to survive in the game's challenging environments, will find out just how satisfying it can be. On a slightly less praiseworthy note, a walkthrough may be advisable for the game's later sections, which I found rather far-fetched at times. Saving frequently and in different slots is essential as it is easy to die or (sadly) get stuck. Despite these shortcomings, this is an experience unlike others, in an overall very good way.
I had some trouble starting the game on my 64-bit Vista, but retrying a few times, or rebooting, will fix this issue. One important character's speech was crackly and unintelligible, but you can restart the game, turn the movies off and read his dialogue in text instead.
As for Deus, the game's story seemed strangely disjointed from its gameplay. Its predecessor had quite an appropriate plot, with twists and intricacies as well as a solid basis for the events of the game; Deus on the other hand, sets the stage for some pulse-pounding action and infiltration, but what does it give you instead?
Well, for the first half, the game is sort of a Robinson's Requiem Light with many of the more satisfying elements removed; add to this some even more illogical puzzles for which you will almost certainly need a walkthrough to avoid wasting hours and hours of your life running around in circles, wondering what to do.
Following this is an excessively protracted underground section wherein the game does pick up some speed and deliver more of what it promised to begin with, but is still marred by confusing and far-fetched gameplay. Many of the weapons are interesting and fun to use, but most of the enemies seem more appropriate to fantasy than sci-fi (dwarves with laserproof platemail, anyone?), and seldom have anything to do with the antagonists mentioned in the story.
I experienced a number of bugs and glitches as well, such as polygons being rendered as solid blocks of color instead of with the proper textures, trees and sheds turning invisible, or your campfires teleporting in front of you when you load a game with one still lit. These naturally hurt the immersion one was so privileged to feast on in the first game...
All in all, the original game alone is well worth six dollars to anyone who feels intrigued by the prospect of a Robinson Crusoe-inspired game of adaptation and survival. If you end up enjoying Deus as well, then that's an added bonus.