There is a big long story behind it, but in a nutshell DCA was conceived during a time of poor leadership at
Disneyland by some executives who are now long gone. They thought they knew more about building a theme park than Disney's own theme park designers, and figured they could build a theme park for cheap and slap Disney's name on it and people would come in droves.
They were wrong. And people stayed away from DCA in droves when it opened in 2001. It was embarassing to Disney and they had to resort to gimmicks to get people to come. Some gimmicks still exist such as the free park hopping for 2+ day tickets.
In any case, DCA attendance of 6 million a year (compared to DL's 14-17 million a year) is far below projections. And the poor reputation DCA holds is a drag on the whole resort.
DCA was built for $1.4 billion, with half that spent on the GC Hotel. So they essentially built DCA for $700 million. In order to build it cheap they did something that Disney normally does not do. They installed "off-the-shelf" rides rather than rides specially designed for Disney.
Maliboomer was one such ride. Most of the rides around Paradise Pier are like that.
These rides also fly in the face of Walt Disney's own personal reasons for building Disneyland - to get away from the cheap carnival-like rides that were available in the 50's at other amusement parks.
Anyways, Maliboomer just does not fit in very well with what Disney is trying to do with DCA and is a leftover from an ill-conceived original construction.
A couple years ago Disney decided to infuse another $1 billion into DCA to essentially redesign the theme of the park and turn it into a true Disney park. At that time they decided to axe Maliboomer. However, now it is not so clear whether Maliboomer is staying or going.
See
Disney's California Adventure Project Tracker IX
Maliboomer removal
Project Status: To begin 2011, but may be delayed indefinitely.
Project Completion: Late 2011
Even with all of the doom and gloom history, IMO DCA is not a terrible park. It has a poor layout for sure, and a number of cheap carnival rides - the Paradise Pier Boardwalk Games area is a travesty IMO (AK at WDW also has an area like this BTW so DCA is not alone in this area).
But it has some positives. We like going over there but there are many rides we have never done around PP. Mulholland Madness is another poorly conceived, poorly themed, carnival-like ride. We rode it once and I never plan to ride it again.
DCA does have the incredible Soarin Over California, GRR, CA Screamin and now ToT, TSMM and TTwC. It is better now than in 2001. The Animation Studios are very cool and often overlooked.
After the park refurb is complete in 2012 it will have a different feel with a new entrance themed around 1920's California when Walt arrive in SoCal. Hopefully Disney will succeed in improving traffic to DCA. Right now they have the right people in charge.
