Toei Animations should of went into this with the awareness of the popularity of the American dub. The soundtrack of the US version was fantastic, it updated Dragon Ball Z for the time that it made its Western debut. The Japanese version sounded dated, but that's what's come to be expected for a series that's like what, twenty-years-old back then. Not hearing the original themes that I heard when first experiencing Dragon Ball Z defiantly takes away the experience. I don't know if this was in the original Japanese version, but the the new dub has this corny-ass opera song that plays when a dramatic scene occurs. There's also the lack of "Rock the Dragon." Dragon Ball Z is one thing, insane macho action. "Rock the Dragon" capitalizes that. The new theme, "Dragon Soul," seems like something targeted directly to kids, and not something that sounded older.
The thing that surprise me the most, is that the Garlic Jr. Saga was removed. I knew that some scenes from the original would be cut in order to speed up the pacing, but I never would of thought that an entire Saga would be removed. I don't care what anybody says, but that was unnecessary.
Dragon Ball Z Kai just seems like the opposite of FullMetal Alchemist Brotherhood. Brotherhood added a lot more fiction to a retelling of FullMetal Alchemist, while Kai just strips down and dramatically alters a series in a bad way.