I've never actually been to California Adventures; I based my "failure" statement on feedback I've gotten from people who have been to it (almost all negative--the comment I heard most often was "It was boring") and the fact that they started a major redesign and expansion less than seven years after it opened.Disneyland has less room than California Adventures, maybe that's why your say that they are a "failure". California Adventures gets just as crowd and it gets really packed during World of Color.
In my opinion Universal Studios was far more interesting before it became an amusement park--the studio tour was longer so you got to see more of the backlot, and there was far more focus on Universal's movie history. Now they give you the bum's rush through the tour so they can get you back to the shops, restaurants, and lame attractions that they used as an excuse to drastically increase their admittance prices.Went to both parks and Universal studios over winter break, I almost felt ripped off when I went to Universal studios. It was my first time going there so I was actually excited, especially the new Transformers ride. That park was such a big disappointment, the only decent ride was the Transformers and the studio tour. NOT worth $80 :thumbsdown