Finished GunBuster!
What an, ah, "interesting"* choice for the final episode. I won't lie and say that my plebe tastes would have liked the ending to be episode 5!
I feel that for the most part I am not an expert at giving in-depth commentary or insight when it comes to many media. I guess I'll just say, for GunBuster, what impressed me the most was the quality of animation. There is something so magical about seeing so many things move around at once. Seeing parts of ships whirr and rotate, laser lenses focus and re-focus, ship hatches opening and closing - I don't know why such simple actions i find so utterly appealing, but GunBuster is full of those moments and it made me happy.
What made me less happy was the somewhat paper-thin characters! I'm surprised that I ended up liking Noriko well before her heroic moments of episode 4, but I think her eyes were drawn big to be in a constant liquified state. I don't really understand what Jung Freud's motivations were: why she suddenly hated Amano/Onee-sama or all the other impulsive things she did... I suppose teenage hormones are to blame, and how all those girls wanted to get down on Coach.

The false moment of drama in episode 5 where Onee-sama has her "breakdown" was so gratingly exasperating; I hate when shows do that. You would think these people would be a bit better trained in their military operations.
But in the end those things didn't matter because it was a fun time. The most impressively bleak aspect was the time relativity. In the beginning it was rather light but I have to wonder why they made things such a depressing downer by the end; I felt it should have been an almost soul-crushing existential crisis. It at least felt that way for idiots like me that actually like and care about these characters. It makes it very sad ending played in a happy way; too bad I'm a sucker that only wants happy endings for my anime (lol, I was thinking that even the downer ending of Black Lagoon's second season ended on a somewhat upbeat note).
Old posts use the phrase "hyper intensity" which I think fits the characters, scale of the story, as well as the quality of animation!
Addendum: It's fun searching the forums and reading other opinions, especially all the vitriol spilled in years' past over the sequel, DieBuster. I'll say just looking at pictures I hate the character designs. I actually am rather fond of FLCL** but I guess it didn't translate well into the "Buster" universe.
*People may be able to say it was an "artistic choice" to do black-and-white, but I want to see those people defend the damn slide-show battle towards the middle/end. Did anyone else hear the pencils dropping in the background and a voice saying "Oh shit! Where did all the money go?!?!"
**perhaps nostalgia? FLCL came out at that "right" time for me in adolescence so it particularly resonated with me. I haven't watched it in years. Do you all think it still holds up?