I'll do my very best but just don't have the time right now. And I'm not sure if I violate any copyright rules by doing so though.
Well in general he's angry about the added scenes (the oil throwing situation in the torpedo room and the banana dance scene), about the not used scene in which the Boot almost sank that spanish merchant (if he wrote the script that would have been the katharsis he says), about the behaviour of the actors - especially his Alter Ego. But he is impressed by the realistic interior the staff built.
What I found impressive was that he already knew - the text is dated 1981 - that from then on this movie was going to be the one example for the uboat war all over the world and almost noone would care what's written in books about it anymore. That's why he wanted it to be authentic and he does consider it authentic regarding the rebuilts and all the technology stuff - but the crew behaviour is all made up. And he thinks about if it's possible at all to transport the reality in such a movie.