The Cybermen usually got dealt a bad hand in the Classic Era. The body horror element that feels so essential to them seemed to get forgotten about after the 60s, leading to them becoming generic robot guys in 'Revenge of the Cybermen' and little more than space thugs in silver jumpsuits by their last appearance in 'Silver Nemesis'. The revival returned them to the nightmare they're meant to be, and I feel that they were explored very well in this relatively underrated story.