I've liked what I have experienced of the game so far. I briefly joined another guild and although I like the idea of running with people I'm familiar with, I left that guild because I was dragging down thier experience due to repeated deaths.
I thought it would be nice to have a guild where the members will traded crafted items of a similar level with other members. That way less credit would be spent on recipes at the lower levels. It would be a guild with the purpose of working together and pooling resources to allow members to progress more quickly through the lower levels of the game.