My Ranking:
1. Disneyland - The theming and the ride quality really makes it great. Also, nostalgia blindness.
2. Six Flags Magic Mountain - The coasters here are great! I think it has some really good top-tiers and amazing second-tiers.
3. Knott's Berry Farm - To be honest, I haven't been here yet, but the connection of coasters and theming looks very fun.
4. Seaworld San Diego - It's Seaworld. It's kind of lacking in the rides department, but I like the animals.
5. Legoland California - The rides suck, the theming sucks, why isn't it at the bottom? The miniland. It was amazing seeing the recreations in Lego, and really was cool since I've always loved Legos.
6. Universal Studios Hollywood - It's like a bad babysitter. It puts you in front of a screen and says "have fun". The Harry Potter land was really cool, but we all know that was J.K. Rowling's land, not Universal's.