I couldn't really appreciate Five and thought he was a bit boring until I realized what it was about him that informs so much of Moffat Who Doctor. It was probably the first time they tried to scale back his Mysterious Alien God-ness instead of continually adding to it, and depict him as a vulnerable, conflicted man who just wants to be nice for the sake of being nice. It's a quietly ambitious counterpoint to Four, whomst has that spark of ''the only authority is my authority'' madness in him and never seemed to suffer any truly dire consequences for that