A good actor makes a good zombie, I have seen plenty of bad actors in great make-ups and it is not worth the effort.
Im not sure as to the purpose of this poll but a few of your answers do not make any sense.
"what makes a good zombie?"
"outdoor home yard haunting" as an answer??????
Also If someone is not in shape then I would reccommend a zombie as the movement is not as taxing as a faster more animated creature.
Slow moving zombies can be scary as long as they have good timing, Playing a zombie is all about training the audience to think you move at a certain speed and they moving a bit faster right when they think they can get away.
Zombies are great for atmosphere, they have great potential to look awesome and be great comic relief. On the flip side of that they can be truly frightening, The guests are in a room headed twords the exit then zombies appear and start shuffling towards them from the sides, then the lights go out the only light is coming from the exit door. By changing the lighting you have allowed the zombies to change their timing.