Chris Eccleston was my first doctor and, although I know it is cliché to say it, but he was absolutely fantastic.
One thing that I've been thinking about recently is the episode 'The Doctor Dances' and, in particular, the scene when everyone is returned to normal. Just his pure ecstasy when he realises "Everybody lives, Rose! Just this once, everybody lives!" I can't get that out of my head. It's like finally, something good (apart from Rose of course) is happening in his life. I think it was a really good way to show his, I guess happiness, I can't think of another word for it. Especially after that turning point in the Dalek episode where Rose 'saved' him. Restored the goodness that had been buried for so long. Haha, other people have done much better analysis on him but I really had to write about it. Just his face, the tone of voice, everything about him. It just made me happy :D
Back to Chris as an actor. He is so brilliant! I really wished he stayed as the doctor for a while longer.