I haven't gotten to see much of Orton play, and all I've seen on Greene was when we played Seattle (and I wasn't that impressed, but he is a rookie, so I'll give him a bit of a pass), but I've gotten to see Lefors play here in Carolina, and watched him play at Louisville once in a while.
Granted, it has only been against 2nd and 3rd team guys in preseason in games 1 and 2 (only Delhomme and Weinke played in game 3), but Lefors is just one of those guys that has something about him. Everyone knows about them trying to replace him at Louisville, but nobody could ever take the job from him. He seems to be a really bright kid that could do something if ever given the chance to play, like in an injury situation. I don't ever see him getting the chance to be the #1 guy, but with a couple of years experience in the league, he could be a serviceable #2 guy.
I'd like to see him do well, and it seems like he has become a bit of a fan favorite here in Carolina, as well, some due to his family background, but because of what he's done in games to this point, too.