I am a very casual player with limited time due to family and work obligations. GW2 is not subscription based, so I am not losing money during the times when I am unable to login and play. This is the primary reason for me. Additionally, I have a few friends (and my spouse) in the same situation so we coordinate a game night from time to time where we can not only play but socialize. Not having PvP in PvE areas is also a big attraction for me. I've tried other MMOs where this is rampant and I did not enjoy it. The combat mechanics are more enjoyable to me than in other MMOs I've tried. Yeah, I'm a filthy casual, but I'm not a 111111'er. I actually do use my utilities and other skills. The community keeps me here, too, both in game and here in the forums. I'm sure that there are a few other reasons, but these are the highest ones for me.