The point I was alluding to was that you seemed to be basing it solely on Microsoft being bad to work with.
They've bought out Developers who were creating good games in order to have them as an in-house entity to keep building the franchise. It creates first party exclusives and good franchises can sell consoles and bring in great money. I'd do exactly the same if I was Microsoft and Nintendo and Sony aren't any different. Even if the Producers who masterminded leave, you've got the basis all their still. Let's not forget either that they sold their business to Microsoft, by doing so they agreed to the terms and conditions. Nobody forced them to sell to Microsoft.
While some people from the outside might love the idea of working on Fable or Halo, and be bemused as to why you would leave, it's still just a job and is like any other business. People will go elsewhere for the money, or because they've exhausted their opportunities, bored in the job and want to try something new.
The only difference with the likes of Peter Molyneux against that of other Producers is that he's a 'name' in the games industry, so it's going to get far more publicity with him moving.
People seem to think he only created black and white or fable 
