Depends what sort of films you were watching as a youngling, really.
Troughton was an actors actor.
He could lead, add to and energise an ensemble cast.
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you could see why Eccleston would refer to him as great.
The man was clearly a joy to work with for many, and a consummate professional.
However, in multi-Doctor stories, the Second Doctor is often misrepresented as the funny one.
The other important lesson is that its possible to replace the irreplaceable.
Hartnell made the show work.
Troughton changed how it could do so.
His appearance is less austere, more clownish.
And yet, he holds his companions hands and clings on to Jamie when dangerous things happen.
Its all very sweet, and completely at odds with the image the previous Doctor impressed upon people.
It set a different tone.
Much of the best dialogue between the Doctor and companions comes from the Troughton era.
The First Doctor is more about conflict.
Despite these differences, though, the best trick that Troughton managed was tomaintaincontinuity.
Besides this, we can see that the Doctor is the same man.
Hes a bit like The Fall, as described by John Peel: Always different, always the same.