The thing about the Christopher Reeve movies (the first two films, anyway) is that nobody has done the Superman / Clark Kent character better. Grounded, wholesome, hopeful, and positive. The movies have their flaws, plot holes, and campiness, but the core character done by Christopher Reeve is the one who most people think of when they think of Superman.
The more modern superman characters done by Brandon Routh and Henry Cavill are dark, brooding, gritty, and deeply flawed characters. No thanks. That's not who that character is. Superman is not supposed to be a troubled and flawed character. He's the character who always does the right thing, is always happy to help, and always believes the best in people. He's a unique character in that way, and turning him into a flawed, gritty character like any other superhero character does a disservice to that character and changes the the core of who that the character is. This is why the Christopher Reeve Superman stands out from most of the other superhero characters.
Right now, Chris Evan's Captain America is a better Superman-like character since he embodies some of the same values as Christopher Reeve's Superman.
