When ever I tried a Vista computer in s store, they took forever to do anything. My brother even bought one and we both tried it out, and was the slowest thing we had ever seen (he took it back). To be fair, the specs of those computers were less than ideal, but when it came time to order mine, even with specs higher than that of the ones I had tried, I payed Dell the extra money to get Windows XP. I will admit that when 64-bit became more common to see (early 2009) any 64-bit Vista computer I tired with 2GB of RAM or more did perfectly fine. I even started to like the way it looked.
I think so many people purchased computers with the minimum system requirements, which Vista just plain can't run on, and had problems with it, that soon everyone was hearing that Vista itself was horrible. I think the computer manufacturers should be partially blamed. I remember when talking to a guy from Dell on the phone while trying to pickout a computer (keep in mind that this was early 2008), he kept insisting I go with Vista business. I said "well all your computers show 512MB as the lowest amount, and 1GB as the recommended amount, so I should be fine with one of those, right?" His response was "Definitely not. You need at least 2GB for Vista. I recommend going for 3 or 4." Well, why sell computers that can't hardly run the OS to people? Why not get rid of the 512MB option for computers that only come with Vista. Why not only sell dual-core processors (Celeron processors were still sold at the time)? If people don't have a decent computer, it doesn't matter how good or bad the actual OS is.