Pros
After a first experience at Lucasfilm (5+ years) started out well and ended terribly, I went back and worked for them again on a consulting basis. The campus at the Presidio is very nice, and of course it is fun to go to Skywalker Ranch, and there is still a strong value to telling people you work at Lucasfilm.
Cons
The atmosphere at Lucasfilm has gotten progressively worse. What was once a dynamic, exciting, collaborative, though very hardworking, attitude has been replaced with one of marked paranoia, hostility, distrust and lack of focus or vision. In the past couple of years, inappropriate behavior, temper tantrums and open conflicts have become the norm. People who are meant to work together won't even talk to each other. The three most senior "managers" at the company are either oblivious or, more frequently, encouraging of this behavior. As level headedly as I can, I would not recommend Lucasfilm, ILM, Skywalker Sound or LucasArts to anyone but those who are most loyal to Lucas and the idea that they may be working in the presence of some sort of genius. George? Absolutely. He's actually a rather nice man, too. He doesn't have any awareness of the day to day operations of his company, though, and can you blame him? The "executives' who work for him, though, are not trustworthy and the overall environment is stressful, unpleasant and not recommended.