There are two kinds of people in this world:
People who prefer Disney World/Land, and people who prefer Six Flags.
The Disney people go for the entire experience. The rides, the characters, the different themed worlds, the food, the shows, and the fireworks, just to name a few.
The rides aren't as big or fast or exciting as Six Flags, but they all tell a story. On Space Mountain, you're going into space, passing through the space station and waving at the astronauts as you chug up to the drop. Splash Mountain takes you through the story of Briare Rabbit in the briar patch. Even the smaller rides like The Flight of Peter Pan where all you do is sit and coast through an enclosed space is an experience
Six Flags people go to Six Flags for one thing and one thing only: roller coasters.
They identify as adrenaline junkies and will drag you on every single roller coaster you come upon. No time to recuperate from being jerked and thrown around. Just go, go GO. Sure the rides are cool and eye-catching, and the carnival games can be enjoyable if you're one of the lucky ones that are actually good at them. Overall, I just can't see myself willingly going.
In the end, I guess you can't really say one is better than the other. One is a vacation spot, another is a day trip. Some people don't want to wait in hour long lines with screaming children waving light-up princess wands. Other people like to feel a part of some big magical world that happens to have churro stands and gift shops. To each their own!