I have been a big fan of Dr Who ever since primary school when I could watch a couple of episodes back to back on Channel Two on a Sunday morning - before, after or instead of my chores, depending on how sneaky I was. Tom Baker was brilliant and I fondly remember Adric, Romana and K9. In high school I would devour a Dr Who book in a single night and watched Sylvester McCoy with the indomitable Ace.
Then there was a period of void, where I forgot about the Doctor.
Sometime later I rediscovered him in the new, more adult oriented books brought out by BBC and Virgin. They introduced an edge to the Doctor and his companions I had never experienced before. I was enthralled by the drama and introspection that resulted in the now common-place "super-hero" tension: the "I can't save everyone" effect (TM). Sacrifices are consciously made, if not willingly; companions die, friends are removed from the time-line.
Later, glory of glories, BBC began making the TV series again. Christopher Eccleston, David Tennant, Matt Smith. I was over-joyed that the Doctor was back with relatively good special effects, high quality acting and even a spin-off (Torchwood). But something was wrong... the stories didn't seem to make as much sense as I remembered - and the sonic screwdriver became Harry Potter's wand. It was being used for every thing from opening mechanical locks, stunning creatures, cutting rope and being an all purpose interface to any electronic system (or biological even). The Doctor didn't have to think his way out of every scrap or scrape. The stories began to feel implausible, I began to get annoyed.
But just recently I had an epiphany. It occurred while I was watching a re-run of The Satan Pit, where the Doctor confronts "The Devil". He says something along the lines of "I don't deny your existence but I don't have to believe you are who you say you are" and it is suggested that the creature survived from an earlier time (literally): that it existed before the Big Bang and survived through it into our time, still imprisoned.
Just at that moment it occurred to me that this is what the Doctor is really about: huge ideas! Science fiction, stretching the imagination just to see what happens. It doesn't have to be internally consistent (it isn't) or eternally plausible (it ain't). The stories are just trying to be enjoyable and wild.
And so they are.