With the DCA refurb going into full swing, all of us have discussed what is wrong with the park.However, I think we blame it's problems on things that aren't really the big problem.
When Disneyland opened, it was the first to use the revolutionary design of the hub with spokes. Every land radiated from a central hub. If we look at DCA, they completely ignored that technology. This means more walking to your destination making people tired and irratable. Also, the hub and spokes dewsign would have led to more defined lands.
The walkways are too wide. They were overcompensating for DL's small walkways. This makes the park seem less personal. Also, there is no shade around PP, wand with the sun in your face and the heat on your neck, it makes everyone uncomfortable.
3. Guest Comfort
Guest comfort doesn't seem to have been considered when it was designed. A lack of quiet areas, relaxation areas, and CUSTOM MUSIC make the area seem desolate. Had they made the park a little smaller, things would be more high enery.
In my personal opinion, there wasn't a real lack of theming in DCA, it just wasn't defined enough. It was just laid out so poorly that it makes you uncomfortable.