Memnoch
Lt. Vulture
For all the crap I get for my opinions I have yet to see one decent argument as to why he's so great.
It's either drooling women going on about his looks or people who like him just because they've been brainwashed by all the crap from RTD in the media constantly telling us he's the greatest thing ever.
He helped really launch Who to the fore again, he was a life long fan who got to realize his dream, he seemed to combine bits from each Doctor and still make it his own and he had a genuinely good time in the role. He drew women to the show and overall reaffirmed it as solid fun FAMILY entertainment.