Eva..fan service? never seen that said about the show before.
Anyhow ignoring that did you like the story line? did you like the ambiguity? rah has a similar storyline: big humanoid like mechs, mysterious enemy, young boy called upon to save the world, military organization with a sinister power head, etc.
i absolutely loved RahXephon. the ending was quite satisfying to me, and although there were a lot of story elements i didnt understand, that hasn't stopped me from buying the dvds.