Originally posted by Time Immemorial
Its really not even a debate if they could, they used Ravens Mutant DNA to copy/counter other mutants they had been in touch with. Since he is not a mutant and not even human, they would not be able to.
Um, he IS of the homo genus. The mutants aren't human either, in the first place.
Superman's powers stem from his biology, which allows his cells to absorb solar energy, giving him monstrously amped physics, as well as many other powers.
Given the nature of the Sentinels power stealing abilities, they should be capable of mimicking his cells.
However, as we've seen in DC before, it is nigh-impossible to imitate a Kryptonian's physiology, even if the person trying to is very skilled at doing so. Beastboy, who has much more versatile powers of shape-shifting than Mystique, was unable to do any better than a Super-dog, and that was only for a couple seconds. The amount of energy that a Kryptonian's cells drink in is simply too great.
Now, assuming that the sentinels lack the capacity to absorb as much energy as Superman, which is VERY likely, we still couldn't say that they couldn't mimic his powers at all. They would just likely be very nerfed, compared to Kal.