The food I've had has never let me down, especially my new favorite, the deluxe burger that is topped with bacon, onion rings, and bbq sauce. The only problems I've ever had here were quickly solved by attentive cast members and that is always appreciated.
We have had some wonderful table service experiences, but Pecos Bills is always my favorite place. The fixins' bar makes the difference. You will find your standard burger and chicken quick service fare, but you can dress it up with sauteed mushrooms and a variety of toppings. You are in the center of the MK, and there is a ton of seating. We vacation in the off-season, so this is usually a relaxing place for us to eat that is not too crowded. I would recommend going outside of the traditional lunch and dinner hours for a better experience. The variety of seating choices is nice too. There is a full dining room with good atmosphere for a quick service, indoor seating with window views, and outdoor seating. Granted, this is not on-par with the nicer Disney restaurants, but it is by far superior to most quick service restaurants.
Somewhere in time, Pecos Bill's changed and not for the better. After my last review in 2009, I returned there in 2011 and was so disappointed, the burgers did not taste like I remembered, the buns were stale and you couldn't get a double with bacon anymore. The Fixins bar is still great, but not enough to save what was once my favorite place in WDW to grab a burger. I have since switched to Cosmic Ray's Starlight Cafe in Tomorrowland.
Good theming, decent quick service food. If this were outside WDW, you would demand your money back. But since it is inside WDW you tolerate it and think it is ok.
One of the largest Counter Service restaurants at the Magic Kingdom, Pecos Bill Cafe is found in Frontierland at the Magic Kingdom.