I saw the graphic novels in the bookstore yesterday, I was tempted, but a friend advised me not to read them, because it'll give away future episode plots.
Other opinions may differ, but I'd encourage you guys and gals to read the graphic novels. As a longtime reader of "The Walking Dead", the TV show departs enough from the comics to represent something new (the CDC visit alone is The Path Not Taken from the comics...interesting times ahead), but I am glad to have read the comics in order to have a good fix on the characters. There have been enough "Whoa, THAT took me by surprise" moments to have made the watching of this TV mini-series worthwhile and original. Darabont has taken liberties with the source material...but thus far I can't say he's done it wrong. Show is amazingly better than I thought it would be; I thought the TV execs would water it down to unrecognizable.
The characters are written so that their brains seem actually engaged in solving the problems they confront. Nobody acts stupid for the convenience of the plot.
It's a good show, but one of my major gripes is that Rick didn't seem all that curious about what caused the zombie outbreak. He just went with it. And to a lesser degree, no one is speculating on what happened.
Rick and the others ARE using their brains (and HE'S been on the go since he woke up in the hospital!). No one is speculating very much on what happened and how this all came about because they're too busy just trying to get through their days and find food, fuel, firearms and supplies, all without being eaten alive. When you're thinking about what you'd need to survive the zombie apocalypse and worried about the people at the camp, vulnerable while you're off with the majority of the guns, your priorities would naturally shift from introspection about why this happened to vigilance over your immediate situation.
Now, that's not to say that as they drift off to sleep they're not thinking about how they got into this situation, but I would imagine their thoughts are more about missing (or eaten...) family members and friends and what the next day will bring or what needs to be accomplished rather than how this all came about and/or how to stop it aside from shooting six billion Zs in the head, which, quite frankly, ain't gonna happen.
Someone safe in their bunker, with ample food/water/sleep and other basic needs handily dealt with, might find the time and mental energy to speculate over possible causes and solutions to the Z situation but when every moment's a challenge to keep yourself and a vulnerable group alive and uneaten, there's not much time for genuflecting over the why of it.
So the lack of exposition over the cause is actually quite refreshing and fairly realistic...and sets the scene for what they're sure to find in the CDC.
Stay tuned!