wether or not Singer read the comics, he's smart enough not to drastically change the mythos (polar bears guarding the FoS, Lex being Kryptonian, etc). he's not making this movie purely for the toys or his ego. he's proven that by flying 12 hours from Austrailia to San Diego for the hardcore comic fans of 2005's Comic con. do you think Burton or Ratner would do that for the fans? hell, McG couldn't even muster up the balls to fly TO Australia! we might not be getting a 100% original Superman movie but i like to think of this movie as a happy medium. we can (sorta) imagine that this movie is the start of a new franchise but it also appeals to the masses...
...plus, Singer is just doing what he does best....making MOVIES. he might not be making a typical comic book movie (Blade, Daredevil, Hellboy) but you also can't blame the man for doing what he's good at...