Loved SUPERMAN as a kid, but that incredibly dumb ending was what stuck with me. Then I rewatched it a few years ago, and I was amazed by how great 80% of it is (but the end still sucks).
BATMAN was perfect for its moment, and had a big influence on not only comic book movies, but comic books of the '90s...but it wasn't always a good influence. And, SUPERMAN is timeless (even as it is also very much of its time) where BATMAN is dated (even with the retro feel).
Also, I think you guys nailed SUPERMAN RETURNS and BATMAN RETURNS along the way. I think there's a bit of a move to re-assess Singer's film, especially since its heart is so much more in the right place than Snyder's take. But just because its heart is in the right place doesn't mean it isn't deeply, deeply flawed (it is!).Meanwhile, BATMAN RETURNS is doing really interesting things - it's my second favorite Batman film (after THE DARK KNIGHT).