I rewatched Eureka Seven after years having seen it as a young teen, and I remember being confused by a lot of it, but I always enjoyed seeing Renton and Eureka's relationship develop. Watching it again I ended up understanding the rest of the series, and I still like it a lot. It's a show with a lot of heart.
Art is hard, but I'm hoping I learned something doing this! Oh and, here's one of the ost tracks: https://www.youtube.com/watch?v=JU3J7d8dpkI