I've never hated any of the leads in the role, so instead I base it on how long it took before I could really accept them in the role.
With Eccleston it was pretty much immediate. He was my first Doctor, and all I really knew. He's stood the test of time too, remaining one of my two joint favourites.
Tennant took a lot longer to grow to like, especially after his treatment of Harriet Jones in his first story. He was 'the replacement' for me for a while, and his forced-feeling romance with Rose didn't help me to like his character quickly. It all changed come The Runaway Bride - Rose was out the way, and RTD delivered consistency with the 'no second chances' aspect of the character when he killed the Racnoss children. The story allowed him to be fun, sad, dramatic and he bounced off Catherine Tate brilliantly. It took a whole series to like him, and he was always at his best with Donna, though without his companions his character was actually rather dull - as the Specials proved.
Smith settled into the role quicker than Tennant for me, and by the end of Series 5 I really rather liked him. It probably helped that I wasn't overly attached to his predecessor, but Vincent and the Doctor, The Lodger, The Pandorica Opens, The Big Bang and A Christmas Carol was an incredibly diverse range of stories - some of Smith's best ever, and one of the strongest consecutive runs of episodes in the past decade. This was largely in part down to Smith. Whilst Tennant's Doctor depended on decent characters all around him to remain interesting, Smith became the main attraction. As soon as he'd settled into the role and found his niche, he was a lot of fun to watch.
Capaldi had a tough job of succeeding two similar and popular Doctor's, with one that is very different and a less conventional protagonist. He rose to the challenge admirably though and whilst the stories felt a little too 'business as usual' for him, his turbulent friendship with Clara made him interesting, and his volatility kept him always changeable. By less than half way through Series 8, he'd settled in and was the Doctor. He's still never sat still for too long and keeps things constantly feeling refreshed, which is brilliant. He's a rather unpredictable Doctor as they go, but it's no bad thing - making him one of the strongest leads the show has had.