Considering that the comic book apparently has a ninja girl who keeps two walkers as pets, the further the tv show strays from the source, the better.
Nothing against the comic book, but the style is completely different and unfitting for a "serious drama". I want the suspension of disbelief to remain intact.
MASSIVE SPOILERS
(RF's spoiler tags suck)
Michonne isn't a "ninja girl"- she's an attorney who happens to use a katana as one of her weapons (wisely so since it's a quiet and deadly weapon). In the comic she first appears with two zombie "captives"- her brother and her boyfriend. She removed their arms and jaws and kept both around to deal with the trauma of their deaths (later, after dispatching them, she holds long imaginary conversations with them not unlike Rick does with Lori over the phone). She also realizes that other zombies would tend to leave her alone when accompanied by her undead companions. The only ninja-ish thing about her is the katana.
I wish the series would follow the comic book more closely. Changing Shane's killer from Carl to Rick removes a lot of the emotional impact and ignores the subtle build up the show has demonstrated with Carl's evolution from kid to defender of his family to borderline sociopath. Allowing Rick to kill Shane was boring and does nothing to advance his character as he had already re-established himself as alpha male. In the comic, when Carl kills Shane, it's the living Shane he kills and it raises all kinds of interesting questions about violence and a child's responsibility to his family in a world where killing is an act that no longer carries the same moral weight as it did when the world wasn't zombie infested. That's interesting- making the main protagonist kill the main bad guy is expected but dull.
Anyway, I find the comic is much more gritty and reality based than the tv show. The comic also does a better job of advancing the plot and making the characters actual well rounded thinking people instead of the tv show's vacuous blank slates whose motivations and personalities change week to week based on the writer's whims.
That's probably just me though.