i've used windows 7 in bootcamp. it's fine, really. a big step forward to improving windows for windows users. but it is fundamentally about a different attitude than os x. if you started everyone fresh, without prior ideas some would prefer windows because of the way it works others os x. os x isn't always better, but it is a different approach. if people have switched, they won't go back unless there is a problem that makes them want to jump ship. consumers are finicky, it's simple.
windows 7 is still just windows and due to it's monopoly much software is either only available for windows or highly optimised for windows. snow leopard is also still just os x. incremental improvements, evolution not revolution. power users are still power users whether on windows, os x or linux. newbies are still newbies.