I already made a thread about this after watching the first episode and half of the 2nd. I've seen one more since then and little bits besides that since my wife is watching it religiously.
I just have to point out that it has really very little in common with the comic. The general tone of it is completely different. The drama hammer is about 100x heavier and more aggressive, and there is no build-up whatsoever. The show had drama dialed up to 11 immediately, where the comic built it up progressively. Only the major plot points of the comic have been retained. Most of the content of the show beyond the very skeletal core of the plot is new material. The cast is like 3 times larger, which also conflicts with the tone of the comics where survivors were much much less common and more sparsely distributed.
My biggest complaint, though, is how they changed the presentation of most of the characters. This is what makes it unwatchable for me, and is a frequent problem I have with adaptations. I read a book and develop this mental image of a character based on their written presentation. Then I watch a show that I'm mentally relating to the book, and the visuals of the show supercede my previous mental image. This is fine when the characters are done faithfully. When they have completely different personalities from one to the other, it turns into a total clusterfuck in my head.
Take Morgan Jones for instance. When I think about the comic, I remember him as nothing but this friendly, helpful guy who was doing pretty well for himself and his kid. He was the first and remains the most mentally stable survivor Rick meets, besides maybe Glenn. (Remember that whole build-up thing? Perfect example.) But that memory can't compete with the stronger visual format of the show, where he's suddenly a paranoid freak in the midst of a massive emotional breakdown pointing a gun at the camera every 10 seconds. It doesn't work. It makes it really hard for me to enjoy either work because of this fight for memory dominance that erupts in my head.
And while they at least got most actors to really look like their characters, Rick in the show has absolutely nothing in common with Rick in the comic. They're both white. That's it. That's the only common ground in look or personality. I'm truly stumped that they didn't make even the slightest attempt at translating the main character. They couldn't even get a guy with the same color hair ffs. Seriously...