Yea the DF makes it so you don't have to join a guild, but let me try and sell you on guilds lol...

1. Depending on your role, the DF could take over an hour to find you a group.

2. When you finally get that group, running with random people means some jerk may just bail the second you get in, and since you can't invite a new person in, you gotta re Q for it.

3.Guilds offer bonuses if I have been informed correctly, something about the level of the guild.

4.Guild members become your friends, even if your only on every so often, you do get to know them and most the time you end up liking a few folks and having good convos.

5.Team mates get familiar with each others play style. This ensures a smoother run through dungeons etc..

Just my thoughts, good luck.