I like Soarin' and find it very enjoyable. I have no problems with it being in a Disney park, but it isn't close to being ultimate Dinsey quality. The additions to the Matterhorn in the 1970s make it hold up really well to this day. Test Track is fun, but it isn't great. Driving around a test track doesn't compare to a Haunted Mansion or the Temple of the Forbidden Eye.
Mission: Space even admits it is a simulator in the pre-show if I remeber correctly. The screen in Mission: Space looks like an arcade game screen.
To the first person that replied, thanks for the welcome. I have yet to see the car stunt show (can't remember the name exactly) at MGM.