I think he can't accept it as a sequel to gunbuster.
I on the other hand don't' mind it too much. What i thought could've made it much better are the re-inclusion of science lessons. They could tell what are the new buster machines about, why do they have to be awakened, etc. What are the topless exactly and how their powers manipulate ether. Much of this are left unexplained making Top 2 feel more shallow compared to Top 1.
Okay so let's talk sequel/prequel that might make it a Top triology. I'm thinking they can make a whole series surrounding Dix-Neuf (Buster Machine 19) and how he got the horn stuck on his right eye, who was the previous pilot that left a scrawling behind an ancient part of the armour, how it lost its left hand, etc. In the last episode, it fights alongside Buster Machine 7 which ends up getting stuck in a comet. Great script huh?
jk