Silly I know, but if Routh is playing Sup/Kent in the Reeves mold, then it stands to reason that Bosworth should have used Kidder's characterization as a starting point to develop her interpretation. She should have played it a little lighter. She also lacks the raw energy that Kidder brought to the character. They needed someone more quirky.
The thing is, SUPERMAN RETURNS isn't a perfect sequel to SUPERMAN I and II. Singer confessed this - he only intended to use SUPERMAN I and II as a sort of vague history, so he could build off of that interpretation. He wasn't intending on really recreating the same characterizations. Singer recognized that the vast break in time simultaneously allowed him to rely on the previous films as well as to bring a new vision to the world and characters.
And saying that Routh's Superman is Reeve's Superman is a gross exaggeration. In fact, their personalities are pretty different. Reeve's Clark Kent is entirely an act - Routh's Clark Kent actually feels pretty genuine, as if he's not so much putting on a show. And their Superman portrayals are also very different - Reeve's Superman is bold and speech-loving, Routh's keeps to himself and feels alienated (after recovering in the hospital, Reeve's Superman would have emerged and spoke to the masses of the USA; Routh's vanishes without a word).
I suppose the best way to describe SUPERMAN RETURNS is that it's an evolution of the cinematic Superman in the way that the Moore era was an evolution of Bond. In many ways, it's part of the same series as the Connery flicks, references Bond's wife's death in 1969 and all that, has the same M and stuff, but in the end it's different. The tone changed and Bond himself changed. Superman has changed, too.
As for who could have played the role better, I have no idea. I'll have to think that one over. Loomis adn Harmsway, anyone come to mind?
I love Bosworth (and HATE Kidder), so I'll keep her. And I daresay, for Routh's quieter, introspective Superman, a feisty Lois just wouldn't play well.
Well, just off the top of my head - Winona Ryder. But - in case y'alll wanna shoot that one down in flames - I freely admit that I'm not a Superman fan (I like Donner's original and really like RETURNS, and would be interested in seeing both cuts of II, but that's about it) and don't really know what I'm on about, so I may be coming across as a Bond layman suggesting Ricky Gervais for M.
Well, judging by Superman's comic book legacy, Ryder's somewhat wrong for the part, but less wrong for it than Kidder was (Kidder is very little like her comic book counterpart).