Honestly, the series is good, but I liked the comics a lot more. I got that huge compendium off of Amazon and read it in like weekend. Every time you turned the page there was something else that made you want to keep going, and with that big a book, I had plenty to satisfy me.
That said, this sprawling post-appocolyptic story borrows heavily from Stephen King's The Stand. It just adds zombies. Replace Stu Redman with Rick Grimes. Replace the Glenn Bateman character with Dale Horwath. And those characters are very, very much the same. And likewise, both stories have a Glenn character.
Survivors are on the move to meet up with other survivors and meet up in very much the same way. They leave signs in both as to where they are going in each story. When Stu Redman breaks out of his holding cell at the CDC, he sees basically the same sort of stuff Rick does when he come comes out of his coma. And they both have this moment where they each go down a stairwell to get out--though in SK's story one of the plague-ravaged survivors grips his leg down at the bottom in a very zombie-like way, then says, "Come down and eat chicken with me, beautiful."
If the two stories were not already enough alike, in the TV series of WD, they even add in a bit which wasn't in the comics where they come to the conclusion that maybe all this was viral and perhaps they should make their way to the nearest CDC. Yup, that happened in The Stand first.
In the Walking Dead, it's pretty clear the zombie stuff comes secondary in both the series and comics, and it's the dynamics of the characters that they focus on. And what do you think the focus is in The Stand that makes it work so well?
Don't mean to dog on The Walking Dead. I really love it. But there aren't just parrallels to The Stand, there are outright instances of borrowing from it, whether on purpose or not. Surprised that Darabont didn't make this realization and approach Stephen King about redoing The Stand as a series and doing it right. Maybe he did. Don't know.
So, if you're missing TWD series, read the source material for it . . . the comics. And if you still want more, read the source material for them . . . The Stand. And lest you think I believe The Stand was wholly original, it is a known fact that Stephen King found a lot of inspiration in the writing of Richard Matheson . . . who just happened happened to write a little thing in 1954 called "I Am Legend." Another post-appocolyptic story including vampires, and which ironically also inspired Night of the Living Dead (switching vamps for zombies), and by proxy, in my opinion it also inspired every post-appocolyptic zombie epic thereafter.