Kalshane...I agree, I haven't finished it yet, not because it's hard but due to lack of time. I still play the first one, but this one will hit the shelf and stay there once it's complete I think. You're right, Faith handled fairly similarly to Buffy, but she was more entertaining at least.
I'm not sure what happened with The Collective, but I sure wish they stuck around. Everything was just of a higher quality. I have stupid nitpicks, but one of the things that bothers me to no end is how the characters can "walk" over things that are above them, there's no kind of climbing effort and it seems very fake. The other one was so close to reality I felt like I was actually playing an episode.
Also the return of Sid was kind of pointless and I got my butt kicked playing him until I figured out how to do his one and only move (where he claws at the enemy with both hands). I still do like it, but I had an endless list of frustrations between the two. The game itself was not at all bad, but it felt like going backwards in quality.