I never saw the entire Rebuild, still have to do that.. I looove the original Eva, though.
It took me quiiite a while to give a try, since I wasn't into it at all until 2003 or 2004, and I regret not watching it before that. I totally loved that series once I started watching it, though, and I'm also big on the manga. My only beef with that series was Shinji's overall personality, but I guess he was supposed to annoy people to a certain extent. It's also safe to say that most of the people who watched that series cared about Asuka, Rei, and the fighting more than any of the male cast.
As for Rebuild, I loved what I saw it, and the animation was so beautiful... ;; I remember freaking out when the trailers for it started floating around online.
Epic stuff, epic stuff.