This has exceeded my expectations so far. The wingsuit is the star so far - it's tricky to master, but learning and seeing improvement is very rewarding. For some reason I've really enjoyed the script and voice acting - not in a 'so bad it's funny' way like in JC2, either.
One thing that has really annoyed me is not being able to find an option to change the crosshair colour, so I can't see what the hell I'm aiming at. Makes target practice very difficult, so I've not unlocked any weapon upgrade stuff after like 20 hours. I'll find a mod for it next weekend.
Game looks incredible when you notice the lighting, though I remember spending more time looking at sunsets in JC2. Could do with some thunderstorms as well. Anyway, I'm sure I'll play this for a few years here and there providing there's plenty to do.