DHS is lightyears ahead of DCA. DCA has no coherent theme. None. It's theme is, "We tried to recreate everything else in California so you don't leave our resort area when you come to the state on a vacation."
As opposed to DHS's theme of "Please don't leave our resort to go visit Universal Studios across town."?
And parks have to have a coherent theme? Wow, you must think that MK sucks with its European medival castle, United Sates old west, world of tomorrow, cartoons, turn of the centrury small town.
I patently reject the idea that a park must have a single unifying theme. I submit that a park can be awesome as a set of unrelated "really cool places to go but can't easily go to in real life, with a set of really fun things to do, but can't easily do outside of a theme park".
AND, that was the problem with DCA when it opened. It has a collection of themes that were things you could easily see ourside of a theme park but had little to no desire to actually see. Airport, farm, mountains, unthemed amusement park, food court, old (I mean historic) industrial district... It let us do things we could easily do other places, like ride a roller-coaster-themed-roller-coaster, a raft-ride-themed-raft-ride, watch plants grow, watch a history lesson, generic swing ride, generic S&S tower, generic wild mouse coaster.
Add in some WDW clones like ITTBAB and Animation and season with ONE really cool, unique, magical ride called Soarin' Over California.....
This is not the makings of a good Disney theme park.
However, since opening, they've added ToT, Bugs land, Aladdin, better parades, bugs overlay of the farm, Playhouse Disney, Monster's Inc, TSMania, Turtle Talk. The retheme of the pier looks awesome. I'm really looking forward to World of Color.
The final transformation with Aerial's, Carsland, etc all look WONDERFUL.
No single coherant theme, but same can be said for Disneyland... the single best theme park in the WORLD, and you'll never convince me otherwise.