First, I'm not negative at all, just sharing my opinion with what I liked and what not, and it is not the same as yours, but that is ok.
I repeat myself I like the set a lot, and when I saw that there was a ship in it, I first thought you have to rebuild the set, but was kind of impressed that it's actually right there. And I liked the guys enthusiasm about the project and the lego classic pirates. And yes you can see step by step how they changed it, and it helps a lot to see the similarity. But still it doesn't look similar to me at all; if you go this chain 2-3 steps further down, you can change the ship by an airplane in the desert or ice landscape, or a spaceshuttle on the moon/mars or whatever. You still have the similarity, but you don't see it anymore, doesn't feel like the same set.
I didn't find any ideas set that looks that diferent from the original, even steamboat willie doesn't, even if they may have changed more...
I understand that you can see that differently, but please try to understand that there can also be other opinions than yours, and they can be shared as well and it has nothing to do with negativity.
Nobody wants an exact copy, but for some there is a diference between a horse and a donkey or a zebra, for others it's just all horses, and for others its just animals.