I personally don't like the new Metro UI at all, if for no other reason than it doesn't look like a windows PC environment. There may be a place for the tiled interface, but a pc/laptop is not that place. A tablet may be better suited for it, but even then I think its fugly.
I was someone who suffered through the growing pains of Vista. My Dell workstation was built for 3D Solidworks modeling with two quad-core 2.0GHz Processors and 8 GB RAM, specific video cards that Solidworks recommend, etc, etc. I could deal with the inevitable lockups and inability to resume from hibernate, as well as having to figure out the new directory structure, etc. So while I had heard plenty about how much Vista sucked, I had no choice but to use it, daily.
I bought a new win7 PC for my home, single quad-core processor, 8 GB ram, and whatever video card came with it. I loaded Solidworks onto it one day so I could work from home. Holy crap! what a difference it made using Solidworks in 7 compared to Vista (and with half the processors). I was amazed that it would make so much of a difference that I decided to throw everything I had at it, namely a large assembly of approximately 2,000 individual pieces and assemblies. My home PC handled it with ease, where as my workstation would take a few minutes to load everything and then would stutter and lag but could eventually work with it. A couple months ago, I was finally able to convince my work that I would be better off upgrading to Windows 7 since I was constantly having issues with my PC.
So while you may have loved vista, had no problems with it, etc. You are one of the only ones that I have heard that actually liked using vista. And I don't believe those commercials at all, of course Microsoft is going to put out a commercial like that. They aren't going to show people having difficulty with their showpiece, getting confused as to why the screen gets dark and gives you a pop up every time you want to change anything, etc, etc.