You really cannot put this all on the user. Microsoft is the one who has stated they are working on the many issues with Vista.
The really big issues with Vista are compatibility, stability, and useability. No matter what any of us say, Microsoft knows it, and that is a good thing. Hopefully they will correct it all in Windows 7.
UAC is probably the single source of most of the complaints about Vista and why people, more and more, are loathing it. Why? It does nothing to increase the security of the operating system. It is like a nagging child all the time asking, "Are we there yet?". UAC is about as useful as that as well. Every OEM computer comes with it enabled,
The difficulty in doing many things in Vista versus previous operating systems can be substantial. Most, if not all, of the audio recording industry is dumping Microsoft and going back to Apple for sound editing systems as Microsoft made the brilliant move to dump DirectSound, which killed many high end audio packages. All for the sake of DRM. This will trickle down to the movie industry as well. A small market with a big voice.
There are real problems in Vista that did not plague XP. At least Microsoft acknowledges the issues, which is all that anyone can hope for at the moment, until Windows 7 is out.
All this posturing about Vista is rather pointless now. Microsoft wants to replace it. Its gotten bad enough they want to dump the name as well. The people really driving this are the OEM computer manufacturers. This is where Microsoft makes it living. The independent computer builder is a drop in the bucket to Microsoft. OEM's are not happy with Vista. Dell is so over it, they are still shipping XP, by using a loop hole in the licensing arrangement with Microsoft.
It is Windows ME all over again. There were also proponents of Windows ME who claimed it was a good operating system too, even though the industry at large knew better. The same thing is happening with Vista.
Side note: Gixer, when you say "RTFM" for Vista, just what manual are you referring to? I have never seen one ship with a Microsoft OS.