Humans are humans are humans are humans are humans.
It's one of the reasons the first character in any RPG (online or tabletop) I roll will always be human. Because there's no way to do human WRONG. It's not possible, and you never have Purple-People-Syndrome (Source).
That said, Norn bore me. A lot. But just how different the Charr are, the Sylvari, the Asura, I'm drawn into all of them. I like the directions each are going. Charr aren't humans with cat ears. Asura aren't Gnomes. Sylvari aren't elves. They aren't rehashes of stuff we've seen before "but different!", they each can stand on their own. And that to me, not needing another race to justify just how yours is different, is what makes all of these great.
Except Norn. I got enough "GLORY" talk from Kormac.