After giving it some thought, it seems like the anger directed at TWD is mostly because its a mediocre-plus show that's masquerading as an epic/great show. Like, it does smug arty stuff like cold opening flash-forwards, but since it isn't a good show like breaking bad, it comes across as blowhardish. Most of the show's grand gestures fall flat. But it's overall a very entertaining show that keeps my attention. As far as raw quality, IMO it is falls between Dexter at its peak and Lost. It basically owes everything to lost, and falls somewhat short in quality to lost.

The dialogue is certainly weak. That all the characters have a 95% headshot rate is dumb. I'd have no problem if the actual badasses on the show like Rick and Daryl got mostly headshots but the others are ridiculous, and headshots with a pistol at 80 feet away is ridiculous for anyone.

But by far the most tilting unrealism thing for me is how dumb and naive the characters are. According to the series Rick wakes up like 6 months or more after the outbreak, yet everyone he meets seems like they are just now encountering zombies for the first time, they have no experience with it and don't seem to gain experience until after Rick has met them. Not to mention the side characters like the naive young couple from last episode who seem like a complete deer in the headlights. People like that should be long dead by now. I think this problem is mainly owed to the major change from the comics, as in the comics Rick wakes up only a month after. It made absolutely no sense to change this.