Err .. I'm not so sure about Ubuntu. And before I get a bunch of penguiphiles all over me, I've used every distro from 6.10 to 8.04, Gnome and KDE, as well as openSUSE and DSL. I'm not Windows biased.
Ubuntu tries to be an everything-in-one solution, which is great. What's not so great is the fact that there are so many developers work on it. Too many cooks?
Ubuntu also doesn't come out-the-box ready to handle whatever you wish to throw at it. The first thing you're gonna need to do before you can handle _any_ media (apart from OGG), is install the restricted-extras package, which is a tidy few MBs. And then, given the constantly-in-beta nature of the software you'll be using, you can expect the odd, inexplicable crash.
Ubuntu also comes preinstalled with a tremendous amount of crap you don't need. Like OpenOffice (WTF), two media players (wtf), 25-odd window styles (wtf), drivers and support software for just about every device (wtf), whether or not you have, will get, or in fact will ever need them (wtf).
Then it has issues with multi-monitor, wireless networking, and (from my own experience), repository-based software. Yes, apt-get is automagic and wonderful, and on more than one occasion, has completely failed to install anything properly for me. The only things I managed to actually get working were the restricted-extras and wine. The rest cost me dear headaches.
So dude, running to Linux isn't an option if "all you want is a simple OS". I've been down that road three times now, and every time, I come back to Windows, for two simple reasons - 1. It works, and 2. It does what I need it to do.
Use it, don't use it. Your headache at stake.