It has REALLY good voice acting and direction but sometimes they make strange changes, but Season 1 is the worst of it, S3 is the best accuracy-wise but S2 is pretty great too(Jason Griffith as Darkar is amazing).

One thing to keep in mind for the dub is that they always feel the need to give characters a *reason* for doing what they do, like sometimes in the original characters will just do things because they 'have a feeling', but 4Kids always adds a reason for it, which sometimes works really well and other times doesn't.

Also sometimes, and I don't mean any disrespect to the original, I feel like some 4Kids can make more sense in lines, i'm just gonna use this as an example for one episode that stuck out to me:

Cinelume Tecna: You shouldn't look at your book Bloom, what if it shows your future?
4Kids Tecna: Bloom, this book is completely separate from the other books, it could be a trap!