Y'know something folks? In many ways, it's much better than FS200, Fly, etc...
In your average Flight Sim, you line up, take off, flick a few switches and land. In ATCC there's so much going on that it takes a hell of a lot of concentration and a high level of situational awareness.
Any ATCO's care to comment? I'd be interested in what peoples opinions would be...after all, Microsoft market their product as being 'As real as it gets', something I'm sure many of us who fly real aircraft, whether it's a Cessna or a 747 would disagree with.