Ok, that's fair, and if we're talking about trading him for the majority of pitchers in baseball, I would tend to agree.
But common, we're talking about Johan Santana, the best pitcher in baseball. Hughes may turn out to be very good, and I'm not even close to giving up on him, but the odds of him being as good as Santana are incredibly slim.
Santana has never really been an injury risk, and he really isn't showing any signs of slowing down.