Reading why people hate Vista is exactly like reading why people hated XP when it was first released. It's the exact same story all over again
Plus the fact that people seem to love to blame Microsoft for hardware-vendors severe lack of driversupport, even though the vendors full well knew that there would be changes to the driver-model. Go figure.
Been running Vista since Beta 1, and I've become more and more pleased with it. Go back to XP? Yeah, sure, the day after the Dovre Mountains here in Norway fall, pigs fly, and there's a lasting peace in the middle east. In that order, please. For my own case, Vista runs smoother than XP did on this box (installed XP after hitting a bad batch of pre-RC patches for Vista and ran on XP between Beta 2 refresh and RC1), I find the interface more intuitive, easier to work with and a whole lot nicer-looking that XP's bubblegum-GUI ever was (or will be). System tasks have been simplified in operation without loosing any of it's options, and I'd daresay that there's more advanced options than you'd find at first glance (the Windows Firewall with Advanced Security in Administrative Tools, for example) if you know where to look (or just bother to look). And, of course, if you
need those options. Never had a BSOD that I didn't provoke myself except when a memory-stick kicked the bucket, have had very little, if any, issues with incompatibility except early drivers for the Creative X-Fi-card I have (had to use XP's drivers until the proper ones for Vista was released).
SP1, while it didn't hold any hugely visible improvements (minor bump in framerates in certain games etc), made the system feel that much more smooth. Currently running Vista on two comps. My gamebox, and a Dell Latitude D630 laptop. The laptop has a gig of ram, and runs what it's supposed to quite nicely (websurfing, email, Skype/IM's, admin'ing stuff at work from home etc). SP1 actually improved the performance on the laptop to a greater extent than what I saw on the gamebox, too.
Calling Vista a disaster is like calling pogosticking in a minefield a safe and child-friendly pastime activity. Besides, Lil'Squishy doesn't command you to switch. If you don't want to, then simply don't.