It is hard to judge dorms at large schools based on tours, because dorms are variable in condition and some schools only show the best dorms on tours.
On the Niche website students that attend Cornell gave the dorms a “C” rating. That is lower than other NY state universities (SUNY Binghampton and SUNY Genseo recieved a “B”) and other large private universities (Syracuse C+, Northeastern B-, New York University B-, Boston University C+)