[Jach]

He'll probably be happy you're letting him go, it's not unlikely he's just disinterested but is cozy enough to avoid seeking someplace better. Maybe he likes some of the other engineers, just not management or the work in particular. I just hope you're this direct when he asks why, and that it's more than just you who is frustrated. I think 2 weeks is fine unless there's a lot of knowledge transfer to be done, but that implies another problem...

One should do one's job in the way one's manager thinks it exists, no less, but the manager needs to make their expectations clear. I had a team member similar to the guy you describe though as an engineer I enjoyed working with him even though management thought he was a negative influence due to his cynicism, negativity, "lack of fire in the belly", etc. He was told as much and asked to change but he ended up leaving the company. From the engineering side management of that team was just bad, a few months later those of us remaining switched to different teams.

Edit: also some people won't like their job no matter what it is if they aren't the ones defining it. They should start a startup, but before that it's not a bad idea to eat and build up a nest egg. Personal job satisfaction is overrated anyway.