Eureka 7 was only emo for the first 13 episodes. It becomes a lot more exciting once you get beyond that and has a touching conclusion that is worth watching all of the episodes, which is a rarity in anime.
Gurren Lagann itself needed a couple of episodes to find its legs. Episodes 4 and 6 were pointless and episode 5 seemed heavily forced in places, but after that, the show found its stride and never stopped.
As for Gurren Lagann, I had heard the ending was bittersweet, and now I see what they mean. Despite protecting the world, despite the sheer awesomeness of piloting a robot bigger than galaxies and defeating the Anti-Spirals so the Spiral races can live on, Simon really gets the short end of the stick. He loses Nia and has no place left for him anymore, he is just a homeless wanderer. But, at the same time, he seems to accept that, so I don't know what to think.
Yoko from the looks of it has settled into a quiet life as a teacher, I really hope she has found some measure of happiness besides the kiRAB, though.
This is truly a classic of epic proportions, and again, is worth some of the iffy earlier episodes to reach the end. Could there have been better character development? Yes. Did the plot not make sense at times? Yes. But at the same time, few other shows in existence are as entertaining to watch as GL was (and still is). Gundam 00 and Code Geass of the "Bandai Mecha Trifecta" each come close, and Gundam 00 in particular is also on the path of becoming a classic, but GL still beats them out in pure, fun, entertainment value. Then again, GL IS a Saturday morning cartoon in Japan. XD
Gurren Lagann, spin on! Who the hell do you think I am?