The problem with this argument is that people are putting Superman the same level as the ridiculously powered DBZ characters.
Superman could flick someone into orbit. Goku could flick someone into orbit, however those people would most likely be nowhere near the abilities of either of the two.
Sure Superman could punch someone sending them hurtling across a star system, granted it's pretty easy since there is no friction in space to slow peopledown.
But lets put the power into perspective.
It's been stated in the series that Goku usually ends up pulling his punches. Because he's a nice guy.
In Dragonball, Master Roshi, with one shot from a Kamehameha, blew up the moon. Completely obliterated the moon.
In Dragonball Z, we have SSJ Goku, who is easily at least 30 times more powerful that Roshi was at that second.
Now lets look a bit more deep into the Super Saiyan, Goku, like Vegeta had mastered the USSJ forms while training to fight Cell, however Goku realized that the USSJ forms wouldn't help that much against Cell because it makes whoever goes USSJ incredibly slower than normal SSJ.
With one nice big powered up shot from a USSJ 2/3(I forget) Vegeta, the final flash, Vegeta could have completely obliterated the planet in that attempt to kill Cell, as we heard from Trunks, Vegeta on the other hand angled it so the shot wouldn't actually hit the planet, just skim most of the surface then shoot off into space.
http://youtube.com/watch?v=vDggiKMiUFwThis is before SSJ2 is even hit. When SSJ2 comes around, shots like this can be fired off without even trying.
Now, if Superman could somehow destroy a planet with his eye-lazers, then he could probably stand a chance against Goku.
Superman may be able to take Goku in a straight out fist fight for a little bit. But as soon as Goku starts using energy attacks, he's done for.
However, the only way Batman would be able to help, is if he is somehow able to whip up a machine that drains life energy and use that on Goku.
Or get Zatanna to use a spell to block Goku from using energy attacks.
If not, if Goku goes anywhere between SSJ-SSJ3(4 does not exist), Superman is done for.
For SSJ3 the fight wouldn't even be fair, one Dragonfist and Superman is thrashed.
http://youtube.com/watch?v=gHJrN-26nhw