Damn Carver, this is a good one; had to actually think for a few minutes and my answers kept shifting the more I thought about it.
I don't think Superman can win his fight under normal circumstances. PIS/CIS would have to play a part in it. I could see him defeating either individually (though not without lumps to show for it), but both at once, especially if they Amp... But I also think that he'll drop last out of the three heroes being "tested'. Team 7-8/10
Thor, for all his power (and being able to use the power boost he gets from Quan's adoration) will eventually fall to Binary/WW, as the two "valkyries" eventually overcome him (though not without a long, protracted battle with major attrition on their side; he lasts *almost* as long as Superman -- I almost had him going down last, but then realized WW does have some chance of being able to lasso him in the battle, which would put an end to hostilities). Team 6/10
Silver Surfer is tricky; either he has some chance to win (especially if he can neutralize Firestorm quickly), or he makes a slight miscalculation and under-estimates his opponents for even a few seconds, and Firestorm mitigates some of his active power assaults while Stardust does some hardcore beatdown. Ironically, if he wins, it will be a relatively quick battle (not nearly as long as the other two), but conversely his defeat (which I think is more likely) will also not take as long as the others. Team 7/10, with Surfer's win being the quickest, but his loss also the quickest.