lexlives, i could understand your point when you say Routh hasn't been growing as an actor if you knew what Routh has been doing lately. i doubt you know anymore than what's been reported on movie and Routh-fan sites. if you don't know what he's been doing from day to day then you don't have room to say what he has or hasn't been doing.
that being said, Routh might not've been the actor Reeve was but Routh also didn't have the advantage of having an actor's director. Donner works well with his actors. he works with them to get great acting on screen as opposed to Singer who just gets okay acting. Routh is a decent actor, he just needs better directing and guidance.
as far as the cast goes...i'll say they're tied. SR has a great Superman, a so-so Lois, awesome Lex, a great Jimmy, and a pretty good Perry along with Richard White. S:TM had a FANTASTIC Superman, a pretty good Lois, a good Lex, and a good Perry....didn't care for Jimmy.