TheSouthern California CityPass gives the term "marketing gimmick" a good name.
Until this spring, the Southern California CityPass didn't include both Disney parks and Universal Studios parks on the same ticket. But now this pass includes admission to Universal Studios Hollywood, Disneyland, Disney's California Adventure, SeaWorld Adventure Park, and the San Diego Zoo for $189 per child and $235 per adult. Compared to the cost of booking each theme park ticket separately, that's a savings of $30 to $46 per person. If you're planning to stop at multiple parks, this CityPass may be worth checking out.
Multiple-attraction passes aren't that worthwhile at many destinations worldwide. Either they tend not to include all the top sites you'll want to visit, or they don't have a significant savings off the cost of buying individual passes.