Now Star Trek, Scotty could fix anything, he got to clime around the under belly of the ship, and he had armor in his cabin, but no one thought of him as weird. How many of us dream of being able to talk about what we like without people glazing over.
The Doctor can fix anything with the little buzzey thing. Phone needs jalebroken? zzzzz done. Car needs started? zzzzz done. It's like a tool box in your pocket! Letherman has nothing that good...yet.
Old episodes of Dr Who and Star Trek have held up very well, however Star Wars and Enterprise don't do all that well. The best example I have found of this is Primer, I saw it first on google video and bought it within a week of viewing.