Mr. Willie's has pretty good BBQ for Pittsburgh. Definitely better than typical chain restaurants. I've sampled their ribs, bbq chicken, mac 'n cheese, baked beans, and broccoli. Their sauce is their standalone winner, its probably the best BBQ sauce I've had ever. The ribs were fantastic. The bbq chicken I've only tried reheated, and it was still tasty after being nuked in the microwave. Eating with plastic utensils out of takeout containers adds to the Mr. Willie's experience IMO.
Mr. Willie's is definitely worth visiting again.