First episode is like Hanson's "Mmmbop".
Last episode is like Joy Division's "Atmosphere".
Unmistakably the work of Hideaki Anno, this series tests the waters for the more expansive, deeper, and genre-defining Neon Genesis Evangelion. Gunbuster has a similar mix of bittersweet self-discovery and sci-fi action, propelled by a narrative of defending the world from space monsters, and a thematic examination of generations and time.
Pretty much everything is great, if not vastly limited by its short 6-episode existence. The pacing suffers a great deal from that, but even some of the shortcomings, like the lack of budget for the final episode, are brilliantly maneuvered by Anno. The stylistic choices he makes there are damn clever.
I might critique the absurd amount of fanservice, it's actually fairly distracting.
For fans of NGE, this is a must-see.