Mate, you knew you'd get me started with this post, didn't ya?
Let's put the shoe on the other foot.... Wine does allow you to run some Windows applications under Linux with varying success. How many Linux applications can you get to run under Windows?
ps - you're right, it's not an emulator as it has it's own version of Windows DLLs, etc... rather than doing pure emulation
pps - Cedega is better for gaming than Wine on its own. Although neither really are ideal. An XBox is the best answer for gaming
I don't use Vista, but I've heard that the latest versions of Grub and Lilo (the Linux boot loaders) both correctly identify Vista and allow you to dual-boot with ease. Again, does the Windows boot loader allow you to install other operating systems, or does it restrict you to only having a Microsoft OS on your machine?
I'd agree with ATI's drivers being very sucky though... but that's a problem with ATI not with Linux