Today was the day I finished watching the classic series in chronological order (using recons with existing soundtracks where needed).
Some thoughts:
I still don't like the Second Doctor's stories. I'd go so far as to say season 6 was the worst to watch (although I blasted through the War Games). Season 22 was aesthetically bad but was entertaining to watch (like a car crash...)
Sixth Doctor wasn't as bad as I remembered him.
I think the show started losing it in season 19. Became more theatrical in set up eg lighting, acting. I think at this stage the program believed it was just enough to show up and wasn't trying as hard.
The Third Doctor's run started off well but at about his fourth season it seemed to start running out of puff.
The Doctor I want to go back ad rewatch is third season First Doctor. To my surprise I think he's edged out the Fourth Doctor as favourite.

I've already done Blakes 7 so the next series I'm planning to get through is the original Outer Limits.