I really hate that everybody seems to know Clark's identity in the universe. I hate that Lois knew his identity even before he started working at the Daily Planet.
They lose out all the interplay and humor and drama that comes from that. That was always an important part of the character to me and it made Superman boring once they started dating/got married etc. It's the same as Peter Parker and Mary Jane.
I really loved the interactions they had in things like the Superman Cartoon version of The World's Finest. IE: Lois is excited Bruce Wayne is coming to Gotham, hits on him right away, Clark has to hide his displeasure, etc.
http://www.dailymotion.com/video/x16...est_shortfilms