First, anyone interested in a table should call them rather than try to book online. If you call you will most likely get your reservation without an issue at all.
Like others said the appeal is for the children. There are a few options for princess loving girls in Disney but not really any dining more targeted at boys. So if you take your little girl to a princess meal you have to balance it out by taking your boy to a dinosaur meal! Their menu is pretty extensive comparatively, but its not what you would consider especially delicious or special food. Its loud, but again, thats great for families. No matter what your children do during this meal, no one else will really hear them. YOu can relax and know you are not disturbing anyone else around you.
Now if you are a group of adults you probably won't really be interested in this place...unless you have a thing for dinosaurs or are especially child like at heart!