Mission: Space isn't a ride that I would enjoy, regardless of the fact that it replaced Horizons. I'm not a fan of any type of attraction that provides barf bags for when your ride is over. So for those of us who REALLY loved Horizons AND have no desire to ride Mission: Space, it's just a cut with salt in the wound for extra measure. Horizons, to many of us, is just as great an attraction as the Haunted Mansion. So for those who don't understand where we Horizons fans are coming from, think of it like this...it would be the equivalent of Disney knocking the Haunted Mansion completely down and replacing it with an attraction where you lay in a coffin and spin around for a few minutes. It's replacing amazing attractions (Horizons, Mansion), with something way less amazing, but still sorta the same theme (spinning space, spinning coffins). You may even throw up...or die...and never even have to get out of the coffin
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