Vista is a good operating system. Much better than XP. Windows 7 is better than both. This article is just another in a long line of "I heard Vista sucks (but never tried it) and 7 is good (but never tried it)" articles. It's a cliché argument with a predictable conclusion. There's not a single interesting, unique, or insightful thought in this article.
Why is it that the entire internet is covered with opinions mirroring this, dismissing everyone who doesn't like Vista as "having not tried it", but whenever I actually ask people in real life, the universal conclusion of everyone who has tried it is that it was terrible? These people who think Vista was a great step forward seem to only exist on the internet and nowhere else.
I know my experience in real life was colored by a few people trying Vista Business early on (on new hardware) and deciding that the new features were not worth the performance penalty. Everyone I know who's done this, including myself, has "downgraded" to XP (as Microsoft allows).
People I know in real life who are considering Vista now are somewhat disinclined to do so, in favor of just waiting for Windows 7.