I also don't understand why this show is rated so high. It was painful to watch.
First. It doesn't follow any of the universal zombie rules. I'm an avid zombie fan and this immediately will ruin things for me. On top of this, the show doesn't even follow its own rules it made! Nothing is consistent. Sometimes the zombie dies a certain way and sometimes it doesn't. If zombie blood drips into your mouth you don't turn, but if it's wiped on a wound you turn.
Second. the characters are stupid and constantly make poor decisions. It makes it hard to feel anything for them when one is lost.
Third. It builds up different storylines and characters such as the girls dad spending episodes to find her or the mean girl in the pink sweater only to let us down and immediately kill them off. It's very anticlimactic.
Fourth. The main bully is the villain and he "dies" way to many times. He can fall off buildings and be thrown out windows and just puts himself back together only to just hunt the kids down again. Yes, your eye was gouged out. Get over it dude.
Fifth. The "halfbie" that follows the kids all to the end has super strength, isn't bothered by zombies, and can pretty much do whatever she wants never helps the group out. There were so many times she could have gone ahead and taken the zombies out to clear a path or help people before they get bit but she never took advantage of her new status to be helpful in any way. She could have gotten supplies but never did.
All in all do yourself a favor and avoid this one.