Anachronox - It was an RPG set in space. For it's time, it looked good. Especally considering that it had low system requirements.
It was fun to play. Easy Learning Curve. Cool Story.
Some replayability as mid away in the game you have a choice of choosing 3 out of 7 other characters. And you get an idea about there past or side story.
There was also a level creation tool for making mods and even your own RPG.
Over all, the game was a market flop, but for those people that did play it, they enjoyied it
There was a few bugs. I remember one of the bugs placed you out side the map. However you can get around it by replaying the last mission again (which took about an hour). And considering it was ION STORM that was doing it, support for the game was died after the first patch.
SiN - Bigest down fall for this game was that out of the box, this FPS was extremely buggy. You can normally get to the 4 level with in about an hour of game play. However if you could get the level 4 to even load on your PC, you are going extremely well. There was a 12Mb Patch out of this game to fix that problem up, and many others. However at the time, people were just still using 33.6k (maybe 56K if you could afford it)
They did do a SiN Expansion. I playied it. It was fun, but it was lacking something.
It did surpise me that only now they are bringing out SiN Episodes after all this time.
It might of been a populare game and all to warrant an exspansion and even an animated movie. But I never really saw many other SiN players out there.