You can't say all Zombie movies are a ripoff from a predecessor or else nothing could get made. Considering there are many versions of Dawn of the Dead, and yet some are pretty good, you can just call it a newer version. World War Z is another zombie movie that's not bad. Also there's a comedy out there about a zombie dating a living girl that was pretty funny. Anyway, Walking Dead isn't so much scary as intense. Where Breaking Bad had a great first season and so so second season, Walking Dead was the opposite and kept getting better.