I have to disagree. Sure, it has "themed" areas, but the faithfulness to the theme in each area is severely lacking.
Cyclone Bay: Cyclone got torn down a decade ago, and most of the buildings in the area are worn, beat, and not very faithful to a waterfront theme.
Steampunk District consists of a new paint job and some home depot pipe creations.
DC Universe is their best themed land.
The sierra crossing is a theme they've essentially tried to do away with- on the cheap. They got rid of the giant tree, the log jammer, did a cheap refurb of Mooseburger lodge, etc.
Rapids Camp crossing is also a mediocre theme, but not the worst area in the park.
My point is that a "theme park" like MK or DL relies on the theme to be a part of the experience and attempts to remain faithful to the theme in every attraction. An "amusement park" like Six Flags might have a theme, but doesn't remain faithful to it and is more than willing to butcher it if needed.
Everyone goes to parks for different reasons, and views them differently and there's really no wrong answer here since this is purely subjective, but I just don't understand when people say Disney is becoming more "Six Flags quality" because while the parks aren't always in perfect shape, they're always better than Six Flags by a long shot, or judge Six Flags on their theming compared to Disney because I don't think Six Flags is trying to be Disney.