Mission: Space replaced Horizons, so that's why I compared them.I don't want to appear negative, but I don't see how it is possible to compare Horizons and M:S. They are two completely different attractions with nothing in common other then being in Epcot. Horizon was a slow dark ride with many show scenes about the future on land, sea or space living. M:S (orange side) is a thrill ride through space to Mars with an action packed landing and with what passes for guest participation. Both were fun, both served their own purpose and one is no longer there.
M:S Green, is not much more then a singular version of Star Tours. Doesn't have the G-force factor of the Orange side but is still fun. Personally I liked it better when it was the same show as the orange side without the g-forces. With the new "just looking at the earth from space" view, it is interesting but not very exciting.