The only problem I had with it was that it took so long and there was no character development, just ongoing exposition, hammering home the same traits about the same characters over and over again. Daryl is gruff, but reluctantly cares, and is determined; Dale is wise and insightful and overprotective of Andrea; Andrea has a huge chip on her shoulder and is determined to prove her self-sufficiency; Shane is ruthless and resents Rick and they keep having the same conversations over and over again. It's not the lack of "action" that slowed it down, but the lack of forward progress, with the characters or the plot. I'm hoping, given the irregular first season, this half was planned as a jumping-on point allowing anyone to pick it up, get involved, and secure themselves for a faster ride come 2012.

Dark barn, not expecting it, shorter than the other ones and easier to overlook... And by the time the slow buildup of the barn scene got going, it was obvious that with this being the last episode in a while and no other way for Sophia to return with a plot development that would appear to take up the rest of the episode, yeah, it was pretty obvious. By the time they got to the end and it was obvious there was some big reveal in the barn, what else could it be?
He very well might not have known. He did say that Otis was the one who rounded them up, and Otis died before they could move past Carl's crisis to give much detail about the little girl they were looking for. As for his silence on the matter, he couldn't reveal how he knew without exposing the barn, and he did not want to risk that, because he correctly assessed the attitude of the group towards walkers and what they would want to do with a barn full of them. And the weird look you refer to could very well be simply a reaction to their own difference of perspective on the walkers. He knows, after all, what HE would do in their shoes, and he can't really believe that this is an issue for the group. "She's still the little girl you're looking for! What difference does it make if you find her and she is one?"

Well, it's his choices and his ideals on how to live his life and address the new world. And he has the right to demand they go. It's not like he's kicking them off the island, after all. If they want to establish a fortified farm under their principles, there are, as was pointed out already, plenty to choose from.

Indeed, and this is the least hot I have seen her look, after recurring roles on at least two other shows, where she was hot enough that her English accent did not detract from it at all.
The rules of love and relationships are not set in stone, and we are no wiser or insightful as to their nature in our progressive times as any other society at any other point in time. People adapt, and a lot of the slow-development of our ideal relationships has to do with luxuries such as leisure time, medical care to extend lifespans, access to greater numbers of potential mates, and fairly set customs for meeting and getting to know one another that people generally follow. In their circumstances, they're pretty much the only choices. Maggie's other options are all a at least a little bit too much older than her, like Shane or Dale or T-Dog or Daryl, and some of those a bit rough around the edges or fairly useless. Glen is the guy closest in age to her, to whom she is not related, and he is, in her assessment, a very capable individual. And she knows there's hardly anyone else left alive, and not many better prospects are likely to come along. A similar situation exists for Glen. She's attractive and closer to his age than the three older women accompanying him. The two members of the road group closest to him in age are married, with the group psycho as her backup mate, and a missing child. Even Andrea is up there in years, being almost a generation older than her adult sister. As with Maggie, she's got a good list of pros, with availability significant among them.
I wish that just once he'd say the prayer and pull back the hammer on his crossbow before killing a zombie.

Starting? Only starting? Did you forget how in season 1 she was pulling the same chip-on-her-shoulder bullshit, attacking Rick at their very first encounter, because he didn't know they were there or that he was supposed to be thoughtful of the safety of the group that had center-of-the-universe-Andrea among its number? And then the world revolved around her sister, and when she got killed, while everyone else was pitching in, and disposing of the bodies and securing the camp, Andrea sat there uselessly cuddling her corpse, and incidentally doubling-down the potential threat in the midst of the camp. And she was the one who bitched the most about having to do the laundry, when she was the one with absolutely no combat skills and all she showed evidence of providing on the scavenging run was a rather useless birthday present for her sister. The reason the women did the laundry was that the men were the only ones providing protection, technical skill, and sustenance until her fishing trip. And then there is the massive suckfest of the current season with the obnoxious attitude (because, after all, it's not like anyone ELSE lost a loved one! Useless Carol bears up better with her only child missing than Andrea did with momentary separations from her adult sibling) and over-estimating her importance, abilities and rights in just about every episode.

Loved the idea of hiding the guns far away in the middle of the swamp, where no one would be able to get them in case of a real emergency, and if that emergency manifested as an attack that killed the most elderly of the group first, everyone else would have no idea where their weapons were.

Andrea has to grow up and learn to take correction, and everyone else needs to stop giving her a pass for her fuckups like the sister-corpse incident and shooting Daryl and throwing a tantrum because Shane was actually treating her like an adult who could handle stress and pressure. Stalking off alone is not just childish, it is not even merely suicidal - it creates a potential threat to the rest of the group, because she could turn into one of those threats if she does get killed, and we have already seen how the group will drop everything to search for a missing member, even a useless one like Sophia, and at the cost of two serious injuries. Andrea disappearing down a dirt road because Shane was not polite and flattering to her would, at the very least, have Dale beating the brush for her.
Shane is just a menace. Even if his attitude is understandable and forgivable, he doesn't work in a group. He wants to play like that, he has to do so on his own. Either you accept that the benefits of being with a group come with obligations, like protecting the useless members, even if you don't want to bang their mothers, or he has to take his survival of the fittest attitude elsewhere before a fitter member of the group realizes they will survive better without having to worry about him leaving another one of them as zombie bait.

It's a gimmick that the writers can use to reveal information at some later point. As I am sure others have said by now, the whole CDC arc is completely original to the show.