What bothers me is that people can't make proper comparisons and argue over something that obviously was skewed to start off with. Compare a continent with another continent, then we have an honest discussion going.
Let's compare GW2 with WoW, oh yeah, GW2 is better!
Let's compare GW2 with Skyrim, oh yeah, GW2 is better!
Let's compare GW2 with apples, oh yeah, GW2 is better!
Let's compare GW2 with Scarlett Johansson, oh yeah, GW2 is better!
You see a comparison in playable area (as opposed to total world area) to be unfair. I think it can be a valid question, since the playable area is what you play in when you buy the game. Of course comparing worlds can be an interesting discussion as well, but just because we're answering the OP's specific question I don't think that makes us fanboys.