Personally, I would not put a screen that big in a room with 8 foot ceilings, but that is me. I think that having that large a screen results in viewing fatigue where you need to actually move your head back and forth to view the screen. Having to move your eyes is one thing, but having to move your head results in being tired after watching a movie.
I liken it to sitting in the front row of a movie theater. I guess some people like it, but myself, I prefer to be able to see the whole picture in my peripheral vision.
Plus if you have two rows or more, you are going to have to raise the back rows up to get over the first row people in order to actually see the lower part of the screen.