To further muddy the waters, we had dinner there last spring, and it was the best of any of the character buffets we'd tried.
Some folks are buffet adverse, and that's OK. Unless a buffet is constantly restocked, it's not going to be as good as a fresh, individually prepared meal. So, going with "apples to apples," I'd say that 1900's character buffet is on par with the rest of WDW buffets, with the exception of Boma, which is a different bird altogether. I'd say 1900 PF dinner is better than Chef Mickey's, about the same as the Crystal Palace, and way beyond Hollywood and Vine. Boma and Cape May Cafe are our favorite buffets, but they're non-character.
If there's one thing that is blatantly obvious here in DISworld, it's that tastes do indeed vary, and that any review is going to reflect the personal likes and dislikes of the reviewer. Even for restaurants that are routinely trashed - Maya Grill comes to mind, as does Big River at Boardwalk - once in a while you'll run across a glowing review. That doesn't mean that one party has a more "sophisticated palate" - it just means that what's good to you may not be good to me.
Of course, a filthy restaurant is not subjective, and I'd pay attention if some dining spot kept being called out for that.
Bottom line - you can't form an opinion unless you've tried it for yourself, and you can miss a real treat sometimes because an awful review spooked ya.
I just hate sinking a chunk of Disney change into a meal that might turn out to be awful, y'know? I guess that just has to be an assumed risk.