No one loves this site more than I but I disagree and that's sort of the point. It's a subjective term. Therefore I'm right. No tag backs.
The search was until recently terrible. Now it's just awful. I only use Google to search PM. The site has no tags or tagging. "Links" is unambiguously Web 0.5 Beta™. And authoring...? You mean like putting content online and then changing it? The concept of a forum and moderators is also firmly rooted in the old web. This forum happens to attract an especially (fill in the complimentary blank) community of users. I'd argue that has more to do with Perl than with the Everything engine.
Again, I adore this site and I don't think it needs to be changed. Arguing it was the original 2.0 is goofy. On the subjective nature of the 2.0 thing, I think if you brought 100 devs, Tweeters, and their ilk who didn't know Perl from Python, you'd get at best 2 or 3 who would agree PM is 2.0 now let alone was in 2001.