Pros
There's only one reason to work at Lucasfilm-- a personal pride in saying you do. To be fair, some of the people here are very smart and fun, but on reflection they are the exception not the rule. The building and campus are very nice, too.
Cons
Pettiness. Infighting. Politics. This is one of the most childish, immature, envy-based environments imaginable. The years I worked there I thought it was great, and now that I have been out for a while I could not be happier. They keep good people down and have an attitude of control that goes beyond secretive-- it's paranoid. The unhappiness comes from the top and works its way down. There's no pride in the end product except on the creative side. No transparency. No professionalism. Claims to be "familial" but in actuality that familiarity is used to the disadvantage of employees; you're trapped in a little box and they'll never let you out. Forget about real promotions or the ability to rise from the inside. There's no growth potential, and no sense of fun in the end. It never seemed that way to me.... until I got out.