So, here are my thoughts on the episode:
I have to say first that I love the new intro theme. I like it much more than Dragon Soul, which I found a bit lacking. This sounds almost like a Budokai intro (and the guitar version in the promos sounded even more so), despite not being composed/arranged by Yamamoto. I thought the animation was a mixed bag. The beginning where Goku flies towards the screen was pretty terribly animated, with his face looking warped and his hair looking like it's growing:
It looks bad in motion too (it jumped out at me when I first saw it):
I thought the Goku vs. Majin Vegeta cut was actually well done. I'm liking Yamamuro's style a bit more lately. Even though this animation is cheap and the models are kept simple, it's pretty well done, and the punches have good weight behind them for the speed they're animated at:
The Gohan and Gotenks vs Super Buu cut felt similar to the Budokai 3 opening to me. It's not the best, but I think it certainly gets the job done. Is it just me, or does Super Buu seem a bit shorter than he's supposed to?:
Vegeta turning around and appearing as a "Majin" was simple, but pretty fluid:
I still think the Dabura and Babidi cut looks choppy, and SS3 Goku vs Kid Buu looks pretty choppy too, though Goku's Kamehameha looks pretty good. I also think the group shot is the best we've gotten in Kai. Everybody is well drawn and posed decently, unlike the first Kai opening with Kulilin standing like he's about to tip over and everyone looking overly simplified. It's odd that this one seems all inclusive, and completely different than the one we saw in the promos. Perhaps that was an early animation before they decided to make the intro all encompassing for the entire arc?
Now, for the episode itself, I'll say I thought the pacing was perfect. I thought ending on the narrator explaining who Goten was perfect. Now, I'm iffy on the music. It's not really bad, but it's not really Dragon Ball either. What's with all of the harmonicas? I know it's just cheerful music though, and I liked the piece that played when Gohan got his Saiyaman uniform, and at the end of the episode. I don't know if any music is reused from BoG, because I haven't seen that yet. I'm curious as to how the action music will turn out.
I thought the ending theme was... not really fitting. It's not too bad of a song, but Yeah Break Care Break is better in my opinion. The next episode preview music... reminds me of Gundam ZZ's NEP music. They both have similar synths used. It's a disappointment compared to the earlier NEP's fully orchestrated pieces, but at least it's still a decent rendition of the opening theme, which I love.
Videl's new voice... sounds a bit too airheaded to me. She sounds kind of ditzy, whereas Minaguchi captured Videl's energetic side. Nozawa was really good too, and I can't wait to hear more from her as Goku later on.
The footage is sadly green, but it's decently sharp. I miss the great dark details of Q-Tec's remastering though. I didn't mind Kai's reanimated bits, but I'm also okay without them, since it makes the footage more consistent at least.
Well, I think that about covers it. I enjoyed the first episode, despite some flaws. I'm a huge fan of the opening and the pacing, and I'm curious to see where things go in terms of music, acting, and pacing.