I’m not sure the Profs, especially senior Profs would be the best source in this area as they don’t dine regularly in the Harvard dining halls…whether the houses or moreso the main hall for first-year students in Harvard Yard.
Incidentally, when my HS classmates and I attended college…some of the HS classmates who compared notes about dining costs/meal with me were attendees at Harvard College. Turns out their average, while being on the high end was no higher than several other respectable/elite colleges in which the average cost/meal was $10.
This included my own LAC back when I attended.
By all accounts, Cornell also has some of the best dining hall food in the nation, but I’ve never had the opportunity to experience that firsthand.