We were in Lone Pine the previous year and was not impressed with the food options available. When we walked into Mt Whitney Restaurant our expectations were low. We waited about 15 minutes before someone noticed us. We finally received menus and drinks and then continued to wait some more. We thought about leaving however we had our drinks. We figured it would take a long time to pay for them so we decided to wait it out. Two of us were previous servers and one was a current bartender. It was difficult to witness the disorganization.
I am not sure if it was because our expectations were low, but when we finally got our food, we thoroughly enjoyed every bit. The breakfast had generous portions and everything was done to perfection.
Another night, since our breakfast was so good, we decided to go for dinner. We all ordered burgers. The burgers were good. I can't say it was the best burger I ever had; however, after a long hike it was pretty good. The server at night was calm, organized, and on top of everything. All her tables were full and we didn't have to wait for anything or ask twice.
The reason I am giving them a 5 is for the area, it was good.
If you have no patience or don't know how to extend grace, service will be hit or miss. Take your own personality into account if you decide to go.