Interesting, I've not noticed that at all. If anything Nathan and Dolphs posts seem to based on facts rather than the unsubstantiated waffle and biase of some other posts.
In fact it's often posts about Windows from a two or three regular anti MS/Vista/windows posters that tend to be full of attitude with the normal "M$", "do you work for M$", "How are your M$ shares" jibes. Coupled with insinuations that anyone who finds Vista to work well and an improvement over XP must somehow be dim and have been fooled by marketing. It's no suprise that you get a strong response from the overwhelming majoity of posters.
To be fair with the exception of Nathan, Dolph and a couple of others most of us have long given up trying to debate using fact as it appears to have no place in the vast majority of anti Vista arguments.
Incidentaly, as an "IT Professional

" I can tell you that we've deployed Vista widely (in excess of 30,000 seats to date) and have so far fewer problems from end users and hardware drivers etc than we had either with XP on release or SP2 both of which had major compatability problems at the time.
It never ceases to make me chuckle to read how people complain about the security features in Vista holding up SP2 as the paragon of a slim OS. How quickly they seem to have forgotton the accusations from Win 98 and 2000 users of the time about how XP was bloatware with major driver problems. Lets not forget how SP2 was the devil incarnate and they'd keep using SP1 because the firewall and other security changes in SP2 broke huge quantities of apps and changed how people used their PC.
XP SP2 is a mature, stable OS although at 7 years old (and deigned before then) it's at the end of it's life. The world of IT (and internet especially) has moved on, you can only patch (using in the literal sense) old code so much to take advantage of advances in both technology and security.
Of course XP was designed to run on PCs with Pentium II procs and 512mb of RAM 7 or 8 years ago so of course it flies on modern hardware. I expect we'll be hearing the same thing about Vista in 4 or 5 years time when the averge user is on 8 core 8GB RAM, Flash drive machines. Of course some will then be complaining about this pants new Windows 7 and how Vista SP2 is a fast stable slim OS.
If you have an older PC XP SP2 will do sterling service for years to come, if you have newer hardware and technology Vista is the way to go as will Win7 in a few years. It's the nature of IT at the moment to progress.