As an older player, with limited time due to real life commitments, GW2 is perfect for me because it is sub-free. That's the biggest draw. Aside from that, I enjoy the mechanics (as limited as I am with them because I don't really "practice") and the fact that I can go to pretty much any map and find something to do with whomever happens to be on that map at the time. I can also take my time with whatever achievements I set for myself (still working on stupid skyscale!) because I don't feel forced to do things as I'm not on any monthly fee.