MMORPG gamers are used to certain things, things like grinding, gear conveyor belts, skinner psychology, and subscription fees. Which GW2 is said to have none of these.
For those who don't know, WoW became successful by being the first MMORPG to do things right to appeal to a larger audience of people by being approachable and easy to understand. They did this by taking features from other MMOs (EQ and Ultima) and making them easier to understand and making them more appealing to a casual audience. They didn't change a lot, but what they did change was small enough to be familiar to old EQ and Ultima players, but different enough to appeal to a larger audience and overall be a better, funner game.
Here is my great fear. Guild Wars 2 isn't doing this "Small change" They are attempting to revolutionize the entire genre in one fell swoop by taking out and replacing long lasting features like Raids, Quests, and the Trinity. It's very different from what WoW is, and is very different from any other MMO that's come out in a while. Will this attempt to change everything attract a large audience of players? Or doom it to underground popularity by being too different.
That's not to say all games that have attempted to change the formula a little like WoW has have always come out on top. But does the MMORPG community need tiny steps to accept innovation? Or is such a large leap in another direction for the MMORPG genre too much to take, to the point that it feels alien to common experiences.
Just to clarify, I look forward to the game and I know I'm posting this is a forum that is generally excited for the game, but honest opinions are a virtue.
TL;DR If you don't have the time to read, you don't have the time to comment, get out.