It doesn't matter if Routh beats Welling in one poll, because from what I can tell, the general consensus is that Welling is a much better Clark/Supes/Kal-El than Routh, and it's true. No matter how much you liked Returns, Singer tried too hard to make Routh like Reeve, and there's only one Chris Reeve. Smallville never dreamed of imitating past performances, and that's why the characters work so well.
People may think Welling is a horrible actor or that Smallville is horrid (mainly because of changes from the comics) but if he went to the big screen, it'd be one of those thing where I bet once they show the trailer, everyone who wasn't a fan starts to act as if they never doubted him.
I'm all for Welling being Superman, but only if Smallville is over by the next Superman movie. He's got the experience, the look, and everything else.