@quarkx
Regarding the default gui on ubuntu, you do realise that you can change the entire look and feel of pretty much any linux distro as much or as little as you like, right? There are a dozen window managers, all of which are customisable to the hilt.
As for Vista, yeah it isn't great. But it does have DX10. Which is all I really use it for 
The CD's they sent me, it wasn't all that apparent, it would not even use my second monitor at the time, but I only had used it of about 20 minutes and in that time nothing impressed me about it, so I had tossed it.
Also XP CAN use DX 10, it originally was coded on XP, but MS chose to disable it in XP for fear that it would absolutely KILL any chance of selling VISTA. There was some 3rd party trying to restore DX10 on XP about a year ago, but I admit, I have not kept up to date on it.
When I had my computer store 90% of my bench work was "Downgrading" VISTA to XP on new computers. 100% of the 500 or so ASUS EECPC's that I sold, the customers had requested to have XP installed before they got them out of the store. (This was the original batch of EEC's) So, I can honestly say after 20 years in the computer field, only about 10% of the tech's I have ever worked with were Linux fans. The public ALWAYS ignored linux., and the thousands of PC's I have built over the years, all (100%) were Windows boxes, because that is what the customer wanted.