The first few seasons of Community are great. I stopped watched after the whole Harmon/NBC dustup. Even though he's back I haven't gone back to watching it. I wouldn't recommend any particular episodes because it's one of those shows where you have to watch a few to get the hang of it's style and energy before you start to appreciate it. Pointing out this episode or that would probably just ruin that episode for you.
I actually really liked the first season of Rescue Me, for what it's worth. After that, not so much.
I liked it. It was a bit "light", in my opinion. Especially compared to something like Through the Wormhole. But it's pitched at the level of "lay people", for lack of a better term, and we need shows like that. Top notch production values, though I find the computer graphics stuff a bit hokey even when it's done well. I never really watched the original so I can't speak to how well it's carried on that spirit, even though the episode was written by Sagan's widow and she apparently wrote the originals. Tyson doesn't seem particularly comfortable yet. He's better being off the cuff, imo. Though I suppose he could improve. I'll record and watch at least the next two.
Big ups to Seth McFarlane of all people for putting up the money to get it on the air, btw.