Personally, I would've preferred it if Bryan Singer had let John Ottman compose his own version of a Superman theme -- continuing in the same style as all his predecessors but making his own fresh contribution to the tradition. To me, the iconic Superman musical sound is not any single piece of music, but the whole subgenre of themes, each one paying tribute to the previous ones going all the way back to Timberg.
Besides, Ottman didn't even use Williams's theme in an interesting way. Rather than exploring it, developing it, making variations on it and fitting it to the action, it was like he just hit the playback button on a Williams soundtrack CD every time Superman showed up. Even a good piece of music gets tedious when it's used that repetitively.