Hmm, in the most basic, he does kind of have a point. And at that, I am probably a very, very Luke person, with Luke being my favorite charachter and Han my second, actually...
He whines and worries and doubts himself, but when he really learns and understands what he's doing, he's good, despite so many opportunities to do worse. He's put in a situation not at all unlike his father was, but he learns from the past and makes a conscious decision to be good no matter what it would cost him, I think. I also just generally like the way he functions as a character, I guess.
At the same time, Han is pretty awesome and loads of fun and stuff. He's cool.
So it's kind of a balance but leans toward Luke, for me.
One of my favorite characters, however, is Grand Admiral Thrawn (though he's an EU-exclusive character)- and he's not in either "camp." He threatens the heroes equally, and there aren't many you can really say that about. I'm pretty fond of him as a character all by himself, though.