Lucas is (as far as someone can be while still breathing) legendary.
He is behind two of the most popular film series ever. Started what would become Pixar, gave Harrison his career break, Lucasarts innovated so much in the early days that you still see games with functions first introduced by them. ILM has it's fingerprints over 80's 90's and 00's cinema like no other FX house. The editing technology that fan editors and independent film makers use pretty much began with Lucas.
Even when he cocks up it adds to the Legend that he is.
The Red Tails interview with Oprah is pure 'silly' Lucas.
He made three good movies.
THX 1138, American Graffiti and Star Wars.
He screwed them up afterwards but the world would be a lesser place without them.