He was a bit too preachy in that. As you point out, a couple of times he went too far in it. But frankly, it's not terribly out of line with the movies and the more rational EU portrayls. Luke's trying not to kill, maim, and generally give into solving everything with violence. That's in line with what we see out of Yoda in the movies after all. And given the context of an extremely violent society in which the best of them embraced a violent way of life it made sense enough.
The ressurection (which was just too much of deus-ex in general) the portrayal of Luke as a powerful Jedi wasn't unreasonable. After all, the Force does make Luke an incredible pilot in Star Wars. So that's not at all unbelievable and the Falcon is a hot-rod of a courier ship anyway.
"Too preachy" is a bit of an understatement.
"You feel the pull too, the bloodlust, the call of the hunt", Luke said, pulling off his flight suit. Beneath it, he was dressed in flowing robes the red color of desert sandstone. "That's the Dark Side of the Force whispering to you, calling to you"
"So, tell me", Luke said, "how did your brother die?" "Shot", Isolder said, "Harravan shot him in the head with a blaster".
"I see", Luke said. "You must forgive him. Your anger burns in you, a black spot on your heart. You must forgive him and serve the Light side of the Force"
"When you remain calm, when you feel at peace, when you show mercy and justice to those who make themselves your enemies, then you will know that you are using the Force correctly. But if you surrender to hate, or despair, or greed, then you give in to the dark side and it will dominate your destiny, take control of you"
Ugh. That's not just "too preachy". that's "Pat Buchanean on steroids" preachy!
I would really hate to be accused wanking off to Zahn's trilogy, but he does it RIGHT. Luke is discplined, controlled, powerful and resourseful. At the same time, he knows how and when to kill, he knows he's got a sufficiently long way to go before he can dictate or teach ANYONE, and he's NOT a one-man army! More like the way a knight is supposed to be(the only decision he made I disagreed with was not finishing off C'baoth in DFR, but he's forgiven for one lapse).
Further, you must have forgotten the following ANH line:
"You bet I could, I'm not such a bad pilot myself".
Waaaaaaay before he started tapping into the Force. He's a good pilot, and the Force makes him better, but c'mon, "Courtship"'s portrayal was just plain annoying.
"Peace on Earth and goodwill towards men? We are the United States Goverment - we don't DO that sort of thing!" - Sneakers. Best. Quote. EVER.
Periodic Pwnage Pantry:
"Faith? Isn't that another term for ignorance?" - Gregory House
"Isn't it interesting... religious behaviour is so close to being crazy that we can't tell them apart?" - Gregory House
"This is usually the part where people start screaming." - Gabriel Sylar