Green Lantern wrote:
Eccleston had a darker nature to him. Matt Smith was bubbly, jumpy, cheerful although could sometimes be a little negative. Eccleston was scarred from the time war, could be aggressive, and I just got the dark vibe from him. And I liked it.
Agreed. Smith had some dark moments
, but his general demeanor was generally much more light and playful.
Eccleston seemed to me to be the opposite. He could be light and playful at times, but was generally a pretty dark and serious guy.
Well, honestly, I'd call that character development
. Eccleston's Doctor was fresh out of the Time War, battle-hardened and angry. Smith has had a lot more time to get over those events, so it makes sense for his demeanor to be a little lighter. What I think Smith did so well was remind you, when he needed to, that even though he's mostly healed from his experiences, the Doctor is still capable of doing bad things.