I just finished playing through the Dark Messiah demo. I must say they did a very good job at using and modifying the source engine. It really reminds me of the Thief series, but with skill progression. I thought that you would pick a class at the outset, but your class is defined by what skills you choose aparently. I chose a bit of everything ( since the demo limits you to only a few skills and points to put to them ). You can light stuff like wooden crates near an enemy and he will catch on fire too. You can kick guys off of cliffs if you sneak up on them. The only few gripes I have are about controls. It seems that the mouse buttons arnt as responsive as they could be. I go to block and I have to press it a few times for it to work. Im not sure if this is because im not skilled enough yet, or if thats a design flaw. Also enemy AI is a bit weird. Sometimes they seem like they are doing well, and other times it seems like they had the AI turned off all of a sudden. All in all I liked it. Seems like they took some of my favorite things about action RPGs and mixed them up a bit for a new flavor.