What was Space Mountain like compared to Mission 2?
Oh, don't get me started. :wink:
Let's just say the original was a more exciting, magical, charming, immersive experience, and one you'd want to ride again much more than Mission 2.
Anyway, Big Thunder Mountain is definitely the one I'd miss most if it was removed, and it's the only adrenaline attraction that I would consider a proper Disney attraction.