I didn't think the episode was slow at all. I mean, they didn't kill a lot of zombies and there weren't many special effects but I thought this was one of the better episodes.
I can't put this show in top tier status, however. Too many times I have to ask, "why the hell would they do that?" And the answer is often, "no one would ever do that." Like months into the zombie apocalypse you'd think there would be protocols for how to deal with zombies and presumed dead zombies, as well as what to do with a person who came in direct physical contact with a zombie. Why would you ever let someone go give a recently killed zombie a freaking hug? Why would Rick's wife (I don't pay attention to names very closely) feel compelled to go get Rick to bring Herschel back when what Rick went to do was bring Herschel back? Why carry so many guns if loud noises bring on the zombie horde? Why not carry spears, swords, machetes, crossbows, etc.? Why shoot a person in cold blood but do so in a way that allows that person to still grab you? If you have time to wrestle the guy and still escape the zombies then you probably didn't need to shoot him to escape the zombies. It'd be okay if it was one wtf? moment every few episodes, but there are often multiple wtf? moments in a single episode.