I personally love characters like Roland, so obsessed with their goal that conflict just comes naturally. Especially if they are theoretically "good" goals. In the Death Note manga/anime/movie, Raito just wants to create a law-abiding society - by summarily executing as many criminals as he can around the world.
- Last Servant
And the temptation to love is there. But I think there has to be an equally strong temptation to hate. Roland works for me as a true anti-hero because he's not always admirable, and because a lot of the reviews I've read of the series genuinely hate him.