I frequently patronize the Basin restaurant because of their lovely breakfast buffet. There's nothing like filling your stomach with biscuits and gravy, sausage, and eggs before a long desert hike, or a multi-day mountain backpack. I can rave about the buffet, which costs about $7 with coffee, and is always delicious and filling. I've never eaten any other meal at the restaurant, so I can't attest to the quality of their menu.
The service is usually pretty slow, even when there's no crowd. It's just slow country. Be patient.
The views from the restaurant are SUPERB! The funky ‘70s architecture thankfully included floor-to-ceiling windows with views across the Basin, its peaks, and the Window. I imagine that a romantic dinner here while watching the sunset through The Window would be charming, if a little out-of-character for the region.