It looks like a lot of folks are in agreement as to the general time when the show lost it's edge. Looks like quite a few people think it's still good. I would agree and now that I think about it should have rephrased the voting option on that last one a bit better.
“I've noticed that about your people, Doctor. You find it easier to understand the death of one than the death of a million. You speak about the objective hardness of the Vulcan heart, yet how little room there seems to be in yours.” - Spock, The Immunity Syndrome
Leonard Nimoy: 1931 - 2015