i will not vote because while it may seem to be a black and white question what he did was more gray.
much like dropping the nukes on japan in WWII it ended the war, but the civilian casualties are uncountable, what we did was wrong, but doing it for the wright reasons made up for that.
light was doomed from the minute he tested it out to see if the book worked "he who rights a name in the Death Note can never go to heaven nor hell" in essence as soon as he found out it was not a joke he was damned so what he did with it was irrelevant so it dident matter how much good or evil he used it for his sole was lost.
but this isn't a discussion about his sole, sooo...
what he did was good at first for the right reasons. (a well my sole is gone, but i can use this now power to make the world a better place)
then good for the wrong reasons. (as soon as the people backed him he felt like he was on a power trip, he was important, not because he was killing bad people but because no one could stop him)
than bad for good reasons (when he was being hunted, were the people hunting him evil? No. but if they had caught him they would have killed him so it was self preservation. and that is as good a reason as i think is needed to kill)
than wrong for the wrong reasons (it became a game, each move he made to expose his enemies also made him vulnerable, and the first person to slip up would loose this game and also there life.)
so the only thing i can say to this is (and i feel that a quote is appropriate) "The road to hell is paved with good intentions."
{of course he cant go to hell can he.}