Nothing wrong with a friendly debate.
I see MIB as a sympathetic villain and Jacob as an imperfect protagonist...
MIB was absolutely not a bad guy for the first part of his life and for who knows how long after he turned into Smokey. He just wanted to leave the island and even by killing his mother he was just enacting justice (as per the philosopher John Locke in the absence of a government). And it can even be argued that he only ever killed people who he thought deserved it after scanning them or who he knew Jacob had assigned as someone who would eventually try to keep him on the island (candidates).
And Jacob was innocent in his life with his fake mom and also just as much a victim, being forced (psychologically) to take on a job he did not want and was not, in his mind, capable of doing well... While it could be argued that he killed innocent people, he had few options if you believe the premise of the show: If he didn't at least try to protect the Light and it went out, they would all die anyway.So, Jacob did the best he could with what he was given and did his best to pick people to replace him who would be better at it than he was, who needed a second chance and who would have what he never had; a choice.
What I love so much about LOST is that there are no 'good guys' - it is about flawed people doing the best they can in terribly impossible situations... people who were so wounded and too focused on their past mistakes. The island and the people they met there helped them see that they could move on to still do good things and find love and friendship.
What makes MIB the bad guy is not what he did so much as what he believed; he gave up on people having any good in them, he saw only bad and so looked out only for his own interests.
What makes Jacob the good guy is not what he did but that he believed there could be good in even the worst people and did his best to give them a chance to see it in themselves. And most of them did eventually.