technically that's not "over-rating" as Skaar has no significant feats yet and what Pak plots for him, will be the determinant for others "rating" him.
think the obvious answer is that Skaar will hitch a ride on the board to go do something, whilst the Surfer attends to other matters
i'm going by what hes done so far, i'm fine with him getting more powerful but that would be a huge leap to him being able to do beat up surfer and take his board.
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Obvious answer aside, it would be overration on a grand scale. I refuse to accept the concept of the "Son of Hulk" even touching Silver Surfer. Feats be damned, that's the kind of shit Loeb and Mcduffie pull.
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if he has Hulk's power to somewhere near Hulk's level, then he's obviously capable of ringing Surfer's bell (physically). so it would just require immense CIS (on Surfer's part) for Surfer to lose.
if Skaar doesn't (and at the moment he's not looking like he does) have Hulk's level of power, then I'm sure Surfer will be cheap-shotted, he won't fight Skaar, he'll know instantly that Skaar is the son of Hulk (CA) and he'll try and reason with him, but Skaar will wallop him greatly for the troubles
thereafter, like a drunk teenager on a joyride, he'll whisk off with Surfer's board, completely ignorant to the fact that it is a part of Surfer and cannot be mastered by any other ...