Do HydraShoks count as "water"?
I have to take exception with your statement that it's "worthless to a LARGE amount of end users". There are LARGE numbers of people who only use their computers to look things up online, check their banking, do some email, etc. My father's one of those users.
He's got an older desktop system that had a completely hashed copy of Win98 on it. This machine would run XP acceptably, but why pay for the license for something that old? I sure as hell wasn't going to put Win98 back on it. I consider it irresponsible to put on an OS that isn't still getting updates. There were 3 choices: buy a new machine for him to barely use, buy a copy of XP to put on an old machine, or install Xubuntu. Xubuntu saved him money, and does, literally, everything he needs it to do.
Also, you can't make the blanket statement about installation. Installing Ubuntu is significantly more intuitive than Windows. Other than the partitioning, which is just as big of an issue for Windows, if not bigger, I'm betting my wife could pull it off. It really is pretty slick.
Biology is the only science in which multiplication means the same thing as division.