Uh, I'm still waiting to see a microsoft product I'd like.. After all the years of using W9x I've got used to it, but I still don't like it.
What comes to m$ games, crimson skies is crap (story line + voice acting is great, but game itself sucks and eats ram like crazy)
CFS2 with 1.9 patch looks pretty but again eats a huge amount of ram and the AI is dumber than dumb, I get ace scores in a bomber versus fighters. The flight model is different from any I've tried, can't say if its better or worse. Damage modeling sucks since you lose lift from wings which show nothing but a couple small holes + working ailerons.. Damage sure does LOOK nice.
The games I've tried so far can only be described with one word: bulky. Just as Winxxx is =)