I am starting to watch classic who since when it first came out my dad was only 2 years old and my mum wasn't yet born, I hadn't had exposure to it, but personally so far I don't really like the first doctor, he spent the first two stories being a generic grumpy old man style character but with a time machine which just seemed stupid, I can't comment on any other iterations of the Doctor until New Who as of yet but I found Eccleston to be my second favourite and Capaldi to be my favourite, Tennant was the Doctor for more time than was good for development and so the series began to feel a bit stale, then Matt Smith came in and I found him to be too happy go lucky, and for the most parts serious stories felt a bit weaker with that style of character, also the writing in his stories was weak, as I say, I can't comment much on Classic Who but I am working my way through it slowly, I am currently as far as the serial where they are searching for the keys so that the Voord can be controlled.