Rewatching the whole show - Season 1
Disclaimer: I know the comic in a general sort of way, I don't like it and I don't care how much the show diverges or how things happened on the pages.
Onto the post, now.
Days Gone Bye it's still a solid episode. To be fair, I think that its appeal comes from the fact that it's the very beginning, so everything is new for us as much as it is for Rick. On the other hand, it dramatically improves on the comic, so it's not just pure perception.
The rest of the season rides on the quality of the first episode and I think it's a little bit on the overrated side. It's not bad, nor even mediocre, it's actually good, but not as great as I remembered.
The characters are adequately presented, but of course Rick, the family and Shane take the lion's share. Among the secondary characters Daryl stands out the most. About the others we are given enough in order to understand them.
Glenn and Andrea are fleshed out a bit more than the rest of the cast, which is basically made of cardboard cutouts and cannon fodder. Dale seems just a plain douche instead of the holier-than-thou douche that is going to be in Season 2.
The Vatos episode is not that great and I feel like is slowing down too much the pace of the story. Again, it's not terrible either and all in all enjoyable.
Now to the truly bad stuff: the CDC episode. I don't understand what they were thinking. It didn't have any impact on the overall story. It didn't provide any explanation to people who needed it to enjoy the show, it didn't provide any insight that would help to find a cure (if that's your cup of tea and not that it did matter in the scheme of the plot) and it really didn't do anything for the wievers who are happier without explanations. I don't know, it seems to me like wasted screen time on a storyline that didn't have any payoff whatsoever. Yes, I know, Jenner told Rick that everybody was infected, but it's not like other groups in the show couldn't figure it out by themselves.
It was pure titillation that didn't go anywhere and fast.
TL:DR - Its' still good, but not as good as I remembered. Still worth (re)watching.