I am a fan of anything robin hood, but everything I hear about Anonymous amounts to a bunch of petty bs.
It's about the same as Robin and his men putting potholes in the roads through Sherwood Forest in their part against Prince John's taxation acts.
If you really believe in something, and want to do something, don't penny ante your actions. If you are too afraid of the consequences of getting caught, then you don't truly believe in what you are doing. Better to just quit and find something worth doing with your life.
This goes the same for Assange. "Oh, lookee what I found out, let's share it with everybody because it is the right thing to do!"
It isn't the right thing to do all the time. There are legitimate reasons corporations and governments keep things secret. Revealing everything can put many people at risk of many repercussions including threat of life. That is not anybody's right to do for it acts against another person's right to privacy and self-preservation.
As for those caught, my money is they are in for a long time in small rooms getting grilled by Scotland Yard's finest for more details in the organization outside of anything electronic. I think we can expect a few more arrests to happen and there are already some names being posted on Interpol.
The Internet is an information gateway, and can be a valuable tool for anyone seeking to better themselves or those things they believe in. It is not the means for cheap attacks and defacement. Not without a truly legitimate result being looked for that aids those people who can't help themselves.