It really doesn't matter -- they are all incredible.
I did not really enjoy a single one of them, castle in the sky was the best but it didn't make me want to watch the rest of his filmography.
It's not bad but it's a far cry from "these movies are all 110/100 and will literally change your life forever". I don't care for animes in the first place so idk, they might be that good compared to the rest of them
It's also possible that a lot of people wouldn't like movies you love.
That said, Castle in the Sky in particular is not only one of the best animations I ever watched, it's likely one of the best movies I ever watched.
I tried The Wind Rises (made in 2013), also found it terrible.
However, before those two films, I had seen several Studio Ghibli's earlier movies and found them pretty good. I thought Nausicaa of the Valley of the Wind (pre-Ghibli but the same group of people, with director Miyazaki) was absolutely amazing. So my impression is that their earlier films are much better than their newer works.