Routh did a really good job. His persona really tied in with Reeve's very well. They didn't have to turn him into a Super-stalker though.
Lois was way off. She came across as a preppy high-school girl that treated Clark like poop. (THAT relationship was REALLY lacking) They tried to give Lois so much strength that she pretty much did not show any sort of fear... like she really did not need Superman at all. Margot Kidder knew when to turn on the screams in the face of death and made scenes more believable. I guess having a kid as a teenager does that. *shrugs*
Character building was there, but the character depth really wasn't. I think that Lois kept it from being as awesome as I was hoping it would be. That is just me, though.