Greetings from Lithuania.
"Walking with the Dead" (2015) is not the worst movie of all time, and that is probably the best thing i can say about this "spoof". I liked that they tried to spoof some famous zombie movies and shows, but they failed or not even tried harder. Characters (more like costumes) that resembles famous characters from the originals are there and they kinda try to spoof them, but usually it is not funny, more just dull and gross at times. There are some very bad dialogs and acting in here, and although i love spoof genre, this one isn't good - comparing any "Scary Movie" installment to "Walking with the Dead" would be like trying to compare "Godfather" with , well "Walking with the Dead".
Overall, whether you like spoof genre or not, "Walking with the Dead" is a very poor attempt to laugh at some famous movies. In order for make a funny spoof they forget to create a nice movie - even good spoofs don't have to be great art, but this one is just just dreadful. But it is not the worst movie or spoof i have ever saw, there are some worst movies, but i couldn't recommend this flick to anyone.