The game is bugged. Not only that there are game breaking bugs that never got fixed, on Windows 8 at least there are also severe lags in the cut sequences. Overall it makes the game really not worth getting. I played until chapter 4, but after chapter 3 the cut sequence wasn't only laggy, but simply broken and wouldn't let me get to chapter 4 at all. I used a savestate at the start of chapter 4 just to find out that there is an effect in that chapter that slows the game down to a crawl.
The first three chapters weren't that great, just solid adventure material with a few illogical puzzles and the usual "you can't do this until you did that" logic of the series. Overall that alone would still pass for an acceptable game, but with the bugs it just isn't worth it.