i dont see how people think superman is in goku's league. This dude has been getting worked by people muuuch weaker then goku
http://img594.imageshack.us/img594/6298/supermanbeaten2.jpg
http://img7.imageshack.us/img7/6653/supermanbeatenlucia.jpg
http://imagizer.imageshack.us/a/img202/9949/supermanbeatenbyatlas.jpg
http://imagizer.imageshack.us/a/img600/201/supermanbeatenbydominus.jpg
http://imagizer.imageshack.us/a/img11/8194/supermangettingownedbyl.jpg
etc..etc...
Styles make fights. Goku would fight Superman straight up without exploiting weaknesses and prolong the battle for the thrill of fighting.
Had Superman fought someone like Majin Buu, Dabura or even Mystic Gohan, he'd probably take an L because their powersets are more custom made to beat Superman. Just like Goku would lose horribly to someone like Brainiac or Darkseid or constantly outwitted by Luthor but he'd probably beat Doomsday. Styles make fights.