You can get to level 20 in a single day of casual playing with the first expansion. You OBVIOUSLY missed the entire point of Guild Wars if you think the focal point of the game was working towards the max level.
I max characters with level 20, full attributes, elite armor, and perfect modded weapons within hours, and yet I've been playing the game since beta. Clearly there's something which keeps gamers like me playing the game which you lack the mental faculties to even begin to perceive.
Go talk to /v/... no wait... don't go talk to /v/. Everybody hates Guild Wars there too. Uncultured philistines...