I'm very happy the canopy is going, but I think my most unpopular opinion about the parks is that the architecture of the Future World pavilions wasn't quite as amazing as people imagine looking back from the present. Some were more successful than others and most of the additions over the years have made them worse (e.g. the canopy or the fish stuck all over The Seas). The park itself was also incredible.
I think, though, in the design of the pavilions this sort of concept:
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mostly ended up looking more like this in reality:
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I am fully ready to get a lot of comments about how beautiful the building in the second image looks, though!