The score in it's own right is fine, it's just how they added it back in. You'll see what I mean when you get to it. it's also kind of jarring going from the new score they had until just after the Frieza saga, to then reverting back to the original score that's just been hamfisted back in there.
I do appreciate the breaks in music now though, it's refreshing from the constant barrage of faulconer even though I do like some of his tracks. It just gives the actors a chance to shine and adds more to the atmosphere imo when in some scenes it's suppose to be a tense moment and you can't hear anything other then a brief gust of wind or something.
Personally, I can't wait until the Buu saga airs.
The original composer for Kai, Kenji Yamamoto, was caught plagiarizing music for his Kai score.
Read more about it here.
Yamamoto's score was actually in Kai until I believe episode 96 (out of 99) during the original broadcast of the show in Japan. Then all the accusations came up, and Toei was forced to pull the music. Fast.
So they threw the Kikuchi music (from the original Dragon Ball Z) in there for the last couple of episodes, the 96 previously aired episodes got the music swap for reruns, and I think only a couple of blu rays were released in North America with Yamamoto's score. They were quickly re-released with the Kikichi score, and every thing after Freeza is only available with Kikichi's score.
It was very blatantly a rush job, which is why you are feeling the way you are about it being added back in. Like they just asked an intern to quickly pick songs off some BGM CD, and put the ones that sound
kinda appropriate into the scene! It is definitely jarring, because Kikuchi's music was obviously composed for the slower, more methodical pace of DBZ, and not the crazy fast pace of Kai.
I'm almost certain that the Buu Kai episodes, if those ever happen, will include Kikuchi's score as well. Hopefully they put a little more effort into fitting the appropriate pieces in... but I doubt it.