I've played several hours of it. It's quite a departure in gameplay and set up from GW1. It's going to take me some time to understand and get used to it. I suspect I will play it for years.
I liked GW 1 except there only seemed to be a dozen or so different things to fight, how many ground scorpions are there in that damn world, and the story fell apart after the group got over the snowy mountains.