Might be a silly question, but, if the programmes are there, and you can see them, and you can watch them and love/dislike, why ask the forum if you should watch them?
My answer is 'D'oh of course you should watch them, every single one available in order.'
Please, really, enjoy. The Tom Baker years are possibly the zaniest. Bill Hartnell was tough act to follow, he is the foundations for the programme that we now enjoy.
Go, waste not your time on forums when there is Doctor Who to watch.
By the way, I use an adblocker on Safari on my MAC, and I got no annoying ads either.