This is a "Yes-No" answer to the question do guilds mean anything in this game.
It really depends on who the guild master is.
Some guilds are just "there" for name sake. These are what i consider a dead guild or psuedo guild. They are just there for name sake.
Other guilds have a good leadership team -- so that means they have a web site and a training schedule and their own objectives that serve that guild and their guild members well.
On a personal note,
When the guilds grow a bit more in feature and neccesity I will create a guild and organize alot of activities for it for the members until then I welcome everyone to contribute to the Urban Rivals Yahoo Group -- a sort of non-associated guild page for all guilds.