Ubuntu "simply works" for me, all my mouse buttons work, my video driver works (without using fglrx), it's twice as fast as windows 7 on the same machine, and i don't need any antivirus & antispyware software using up resources.
I don't know why people keep using the market share theory as the reason why linux is safer, linux has the market-share majority in servers & has done for a long time, yet where are all the viruses for linux?