I've never had a meal so bad at WDW that I'd never go back. But while not a TS spot, the ABC Commissary on our last visit was pretty challenging. Ditto Pepper Market. I'd give 'em both another shot, tho.
We did have sort of an unpleasant experience one night at the old Concourse Steakhouse, but it's gone now.
But, just because my experiences were less than stellar, that doesn't mean that YOURS will be. Just trying to keep it real.