New reader, here, I just finished the archive at a dead run. I'll try not to go as in-depth as Wandering Observer did, because it looked like we had very similar critiques; all the same, I'm going to tell you what I see in LB. Be forewarned: I'm a die-hard liberal; the obvious conservative themes of the comic have definitely left me with a bias, and it probably works into my evaluation.
There are a lot of successful webcomics out there with poor art; Giantitp.com's "Order of the Stick" is done entirely with simple shapes and bland backgrounds, but it's still one of the best-known and most loved comics out there. Hell, "XKCD" is just hand-drawn stick figures, and has a following.
There are several with weak story or characters whose art is impressive enough to offset this weakness.
Unfortunately, your comic suffers from a touch of weakness in both areas. the art, as discussed before, has shown marked improvement, and I applaud your development as an artist (stick with the shading, it's much more pleasing to look at). And some people have a story to share or joke to tell but no artistic talent to speak of; I mean, you're better than I guess I'd be at drawing.
Your real downfall, then, has to be the weakness of the characters. Like the Observer said above, LB is "too perfect." We've yet to see him struggle with anything on a moral or emotional level, at least since his decision to become a hero. In fact, his earlier exploits bordered on psychotic; it was like he took a weird pleasure in taking down crooks, not because it was right, but because he could. It seemed at first as if it was a game to him. Even later on, he lacks realistic human characters; he spouts "wisdom" with perfect confidence, he has no interesting relationships (even Our Lady of the Purple Hair doesn't really play a role outside of serving as a possible cliched romantic interest). The most compelling character so far has been a villain, the Darkbringer, as one who is sure he knows what's right despite it being different from the common view. He seemed more believable than LB, who goes from distressed over a villain's escape to ready to go continue the arse-kicking in ten seconds flat.
And the dialogue has never seemed real; it's all told with one voice, clearly the author's, just emanating from different sources. Even simply giving someone an accent would help; as it is, the only way to distinguish betweem one character's sort of speech and another's is to guess whether Lewis likes the character or not, and that only gives you a chance of getting it right.
I would love to see a reason LB has powers, too. Superman was an alien, Spiderman was bitten by a radioactive spider, Batman is just rich and bored, but LB has nothing. No story to his powers, no science, just "Oh would you look at that. I can do things!" He doesn't even wonder himself, doesn't question why he's different, just beats up bad guys. Whee.
Overall, the comic seems to serve one real purpose. It's a fantasy world for the author. No offense, Lovhaug, and I'm not saying you're crazy or have problems or anything. I, too, have written yarns abut characters who are built around me. But your whole world is; everything seems to exist as an outlet for political rants, philosophies (which I personally tend to disagree with) and projection for the author. The story is buried beneath it, and it's mostly burdensome. Some things (needing violence to attain peace, for instance) can be worked into the story with some grace, which you've managed somewhat. But it gets excessive in LB. Think more about the story, the characters, what makes LB unique in a world of comic heroes. Write that. Don't turn it into a battlefield for your opinions alone.
I'll conclude with a positive note; I will continue reading LB, for a while at least. Even when I disagree with it, it is an easy read; it doesn't drag, or get tedious, or make me wish I'd never looked at it. It has potential. Work that. And don't hate me for being critical!
Or hate me if you so desire, I suppose. Your call. But you seem more reasonable than that