I'm of the opinion that a restart would've worked better. Singer did a good job directing SR, the FX were great. The cast was just okay, though it could've been better-Lois, Perry White, & Lex mainly.
As much as I like the Donner films, you can't recreate that magic with a whole new cast and in a different time. Today's movie audience is far more used to flashy FX and won't be awed just to see Superman fly, esp. after the Superman-inspired throwdown at the end of Matrix Revolutions.
It was a mistake for Singer to try to make a sequel for the Donner films instead of just reinventing Superman for the 21st century. It seemed like he would be up to the challenge for that. He did a good job bringing the X-Men to the silver screen.
Singer's attempts to contemporize Superman-the kid, the religious references, the lack of American Way, didn't work for me. If anything they created something of a disconnect for me. They make him less relatable or heroic. Who wants to be an absentee father? Or stalker? I've also never seen Superman as a god, though admittedly he had god-like powers. I would've just played up the alien angle, like Smallville does.
The scenes with the kid were fine, but like another poster said, I just feel that it will only be mishandled and complicate things in future movies. You could still have Lois be frustrated with Supes without throwing a kid into the mix.
I also wanted to see a more modern Luthor. Come on Singer, you have comics, cartoons, and Smallville at your disposal, and you don't read/watch any of it? How could you not incorporate some of the post-Crisis stuff into the movie? That's lazy to me. I mean, the comic and animation guys are producing work that is resonating with people, and you can best believe that the people reading the comics and watching STAS/JLU or Smallville were some of the first in line for SR. Not checking out other, more modern interpretations of Superman was ill conceived on Singer's part.
I wish Singer had at least flipped through Lex Luthor: Man of Steel, or had watched at least the first episode of STAS. I would've rather seen that adapted to film than SR.
I enjoyed the John Williams score. That is the best Superman score, and it really got me excited. SR didn't live up to the promise of the opening credits.