Someone posted a video recording of his last experience on the info hubs. I wish I could find it. It was pretty much the same experience I had
You're probably referring to the SecondDrama Youtube channel right?
http://www.youtube.com/user/SecondDrama/
There's over a 100 videos on that site that show griefers at welcome areas doing their thing.
If you ever decide to hang out at welcome areas for the first time (which I don't recommend), the videos on that channel should make it fairly obvious as to who you should avoid and how to protect yourself from griefer attacks.
I also agree that Linden Lab really needs to either abolish these places altogether or find someone to moderate them.