I'm pleased with Windows 7... So in order the counter the FUD i'll explain. Also, don't read this to merely complain I'm spewing crap: I know I am.
I'm an 'old school' zipslack 3.4 user. I not-so-recently installed ubuntu on an away-from-home PC that sits at my parents, and admin a decrepit centos-4 virtual machine. I've come a long way on RH machines.
I'd like to think I know what I talk about when I talk about the desktop: I've tried QNX ("things work"), BeOS (50Mb of "everything works all at once, weee"), and various Linux GDMs - fvwm95 being "good enough" for me. I'm a part-time KDE fanboy too. I'm a Vista-hater, although I do put up with it on my laptop because I have to (came pre-installed/don't want a Linux laptop)
Prior to Windows 7 I ran XP64. I didn't upgrade to XP32 until after Win 98 was largely depreciated and support began to stop (for the first time), as Win 98 was "perfect" for me (so was Communicator 4.72, but that's another story). SP2 was out shortly after I upgraded to XP, so I didn't feel any of the pain people consistently remind me XP had. I upgraded to x64 a few months after it came out, (again missing pre XP SP1 problems since XP64 is Win 2003 + SP1) even though I couldn't use any wireless adaptors, I praised the Win 2003 'core' stability.
So... with all that: I like Windows 7... *BUT* I have a brand new 4-core, 6Gb, dual ATI beast to enjoy it with. My initial reason for buying it outright on preorder (£140!), and not going the student edition upgrade route (£38) was that I wanted the "Pro" edition for gaming, and another licence not an upgrade in situ copy (I've plenty of working license via my MSDNAA membership, but this year I don't have access to Windows because I've switched away from the Computing dept).
I also wanted to experience a newer OS that had multiple cores in mind. As an LWN reader and Con Kolivas fanboy, I knew I wasn't ready to move to a full Linux desktop: I don't want to configure my graphics card to work, and the new open source ATI drivers won't power my games like they do under Windows (I spent money on my graphics card, and I want to make use of it!).
I usually theme to Windows classic without exception, and did the same with Windows 7 until I decided I wanted a transparent taskbar - so although I've small icons, quick launch and zoomed out on my desktop for smaller icons (CTRL-mouse wheel everyone), I'm happy with the Windows 7 UK theme. The new Win-key short-cuts are pretty useful!
It's the little things I'm pleased with. The console defrag has a parallel option, and works great out of the box - I can defrag a HD and watch videos without *any* stuttering. The native h.264 codecs work well (although I haven't tested them much they were the 3rd thing I upgraded b/c of a TV Versity transcoding limitation - ie: upgraded to recent codecs/and TVV needs to be a "user" service etc).
I'm pleasantly surprised with the instantly available/stripped down Media Player: under Windows 7 it's x2 as fast to start as Media Player Classic - the only annoyance I have with it is how small the track bar is, and that I can't use space to pause or my mouse wheel for volume.
oooh time to go to the pub!