Windows 7 is really good for a Windows product, and I would say that it has closed a lot of the gap between it and OSX. On the other hand Snow Leopard hasn't really been able to show its strengths yet as most macs are still dual core and not many programs take advantage of Grand Central.
However, within two years, mac users can pretty much expect a new feature packed OS based on the solid foundation that Snow Leopard provides. Windows on the other hand, based on past history may not see an upgrade for a while and Windows 7 is already the feature packed update based on the foundation of Vista.
Windows 7 also has Grand Central type workings under the hood. It's better than vista, nuff said.
I think what most are missing from the article is the the talk of Virus's, Security flaws still present in Windows or the bad NTFS file system it's still stuck with. It's not WRETCHED like it was but it's still not up to snuff with OS X, BSD, and some flavors of Linux in those regards.
What people are going to care about the most, end users, is that it's faster than the crap they had before (vista), can run XP stuff (XP VM) and it comes on the new $399 quad core PC they just bought at the store (yes, you can buy a quad core pc right now with windows vista and 4gb of ram for $399).
When all you've had to eat for the last 4 years were plain crackers, I stick a cheeseburger in front of you it's gonna be the best thing in the world, right? But what about the table next to you that's been dining on Lobster and Fillet for the last 10 years? They just got a new recipe, nothing drastic.