I miss Ray Scott, Van Patrick, Curt Gowdy and Al DeRogatis---probably because I grew up on '60s football---but I agree with a lot of people here that Madden & Summerall together were probably the best duo ever.
I also miss Cosell. At the time, in the '70s when MNF started, I hated the guy---too mouthy and self-absorbed and self-righteous and so on. But he was, as my dear departed mother-in-law liked to say, "a real character." High praise.