I won't do it. It's hard on the bike, it's dangerous, the visibility sucks (for me and car drivers), the traction is iffy, and it's freakin' uncomfortable. Even with rain gear, I still get wet, and that is just miserable. I don't mind suffering on a ride, but misery is another thing!
Those of you who do ride, no matter the weather, well - more power to you. Me, fair weather rider (even on my motorcycle)!