Hartnell & Pertwee
They should be on this list.
I remember going to an SF con as a teenager and wondering who the guy with the perm and the scarf next to the words "Doctor Who" was. I'd seen Doctor Who, and it wasn't him! I came to like Tom Baker later, but it took a while. Hartnell _is_ Doctor Who to me. The mystery of the early episodes, never knowing where things would go or what the Doctor could do, is something later episodes just can't match.
I'd have expected Pertwee, Jo, the Brigadier, Benson and the gadgets to come high on the list,too. Ah, well. Talons of Weng-Chiang made it. Unearthly Child belongs there, too.
And Fang Rock--if nothing else for:
"Are you in charge here?"
"No, but I've got lots of good ideas!"
Still gets me, every time.