A simulator ride is where guests are shown a screen while their seats or vehicle corresponds to the action on screen. The clear cut example would be the Amazing Adventures of Spider-Man ride at IOA and USJ. When the Electro from the screen attacks the real-life guests with an electric plug, the vehicles shakes uncontrollably when he does that. That's an example of a simulator ride. Think as if the guy from the screen actually does that out of the screen and into real life to attack you.
Now lets look at Guardians of the Galaxy Mission Breakout at DCA, it's not a simulator, but rather a tower drop that is rethemed from the Hollywood Tower of Terror. You see the Guardians going into action, but the elevator does not correspond with the screen, since you're rarely taking any action in it. You just clearly watch what they do, not partaking any action with the screen.