Dead Shack is not heavy on scares and the zombies are practically an afterthought, but if you like juvenile humor there’s a dark streak to this film that delivers in the end.
The Ghost Galleon is essentially another reboot/reimagining of the basic concept of undead, blood-drinking, flesh eating Templar knights with little to no relation to the previous two films.
Don’t Kill Me is a pretty uneven attempt to graft a number of well-established vampire story tropes onto the zombie genre that kind of works enough to sustain some viewer interest.