Just to throw this out there, but I absolutely hated Neon Genesis Evangelion... so you'd better hope they have very little in common.

But it wasn't because of a kid being forced to fight giant aliens in a mecha. It was because it was long, boring, depressing, and the main character was beyond a wuss, and retarded. Oh and it pretty much built up to nothing happening, and was extremely overhyped. Everyone kept saying it was "soooo good" so I just kept waiting and waiting for something amazing to happen and the series to pick up, but it never did. It felt kinda like watching a mecha anime where the main protagonist was
Raki from the Claymore anime (the one in manga was ok), except instead of being emotional he was just depressed and filled with angst... It was like watching Twilight without the vampires... just following around this boring angsty girl.
P.S. Silhouettic I've seen Ikkitousen and it's even on the list in the OP. Also, Eureka Seven was the worst anime I've ever seen in my life and has been one of the two (Ergo Proxy being the second) that I've actually deleted from my HDD it was so bad.
Soul Eater was like... a kids cartoon. Definitely the younger side of shōnen, even the animation was very child-like.
@The Melancholy of Haruhi Suzumiya - I've seen it. Not sure why it wasn't on my list. Probably cause I watched it before I started the list and it just didn't come to mind. But uh... that doesn't even remotely qualify for what I asked for in this thread.

Remember guys, Action + Marathonable. I don't just want every dub you've ever seen... I want things that are as marathonable as something like Dragon Ball Z.