I stopped playing before WotLK came out, and rejoined before Cata was launched. BC was the high-point for me, really. But, I will be totally honest- I miss raiding Molten Core over two nights. 40-manning an instance, though insane by today's standards, was just way too much fun.
Just wanted to point out that I watched the Congressional hearings involving the RIAA and Napster back in the day. Thing is, when Napster was at its peak, music sales were the highest they'd ever been. I think this further proves the point that the people that will buy a game/music/movie will buy it, and those that won't will not. Companies really aren't losing that money.
What did it for me is that this game is "inclusive". The dynamic events,WvW, PvP, dungeons, etc all encourage players to group up- even just a mob who happen to be in the same place at the same time. The gathering nodes are shared, so they're not a race to see which character gets to gather first, or who hits a mob first to get credit. Its virtually impossible to grief other players. You couple that with good storytelling, amazing artwork, and those little nuances (like the asura children telling "Your mama" jokes, for example), and you have a winner. Its really going to throw a wrench in the whole tired MMO genre, I think. It has for me, and I've tried them all since EQ.
I suspect they had to take the login server(s) down and fix them since there have been reported issues with the EU, and some of those guys play over here on the NA servers. I don't believe they'll be down all that long. I'm nearly certain its not a server load issue.