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You wouldn't go into an Apple store expecting everything to work on your Windows box. You wouldn't go into a PC retailer and expect everything to work on your Macintosh. Why would you go into either one and expect everything to work under Linux.
I did my research before buying a Linux box, and every bit of hardware works once it is booted off a Linux installer or live CD. I don't need to use dmesg, Google, forums, mailing lists, how-tos, or the midnight oil just to get things working. In fact, I barely even had to touch Google in order to do the research.
Now if only I could say the same thing about Windows, which can hardly be considered as stable unless I download the latest drivers from ATI.