Its OK. The food is fairly decent. Kind of a buffet version of Whispering Canyon, if you've been there (no antics, though). Depending upon the crowd that night, the lines can sometimes get long waiting to pick up food.
Is it worth a special trip? Probably not. But, I've enjoyed it when I've gone and its fun to walk around Pioneer Hall and Fort Wilderness.
Someone can correct me if I'm wrong, but I think you have to catch two buses to get there: one to get to Fort Wilderness, then the FW loop bus to get you back to Pioneer Hall. A couple of other fun ways to get there would be to get yourself to Wilderness Lodge and walk, if its nice out (I think about 0.75 miles), or go to Magic Kingdom or Wilderness Lodge and take the boat.