> English dubs are usually terrible in general. I'd mind them a bit less if they were just faithful translations using different voice actors, but so often they dumb the scripts down and add a bunch of other changes as if no one in the English speaking world could appreciate it otherwise.

The later Ghibli films (which received proper localization in English) are mostly quite good. They aren't perfect, but increased awareness of Miyazaki in the west (and from Disney no less) meant that it was worth spending the money to do them well. In general they have good writers and voice actors, and demonstrate a respect for the source material.

The earlier Miyazaki stuff, before he was as well known here (like Nausicaä of the Valley of the Wind or Laputa: Castle in the Sky) ... well... not so much (I do think Nausicaä was eventually redubbed, though I'm not sure how good it was).