I bought GW2 when it came out and have never joined a guild. I've never felt there was a particular need to, which I find quite sad for this game, especially as I found guilds an integral part of GW1. Personally, I feel that GW1 had more of a community feel to it, but also there was a need to be a part of said community as it'd be hard to solo the game. GW2, on the other hand, I believe lacks the need for social interaction as well as co-ordinated, co-operative play. (Note: I only speak from a PvE experience, I can't speak for PvP/WvW). I'd love for there to be more incentives to join guilds and be part of the community in GW2, I think that's a significant thing the game lacks and could very much benefit from.