I pre-ordered GW2 so I was able to play in some of the BWEs. Fun game, I only got to about level 10 in any class. I liked how the world quest other people could help you do, and I also liked how each character has there own story.
One of the issues I had with the game so far, and I don't know if it will be addressed at release or not, is learning how to play the classes. For instance when you roll a thief, you get initiative. Playing for the few minutes I did with it, I wasn't sure how I used it , or how I got more of it. I realized that it was somehow important to the thief but wasn't sure how.
Another example is when playing a mesmer. My abilities of my class , the F1-F4 abilities were about sacrificing my clones and phantasms. I didn't know when I should do this. When I used the scepter I got a lot of them to blow up. When I used another weapon I barely got any. Should I sacrifice them with other weapons at all? Only a last resort?
I would like GW2 to implement a basic tutorial system, to at least understand the basic mechanics of the class you are playing.