How to define win?
Michael won his criminal war with Roth, but lost his personal one. One could say that his desire to win the criminal war blinded him to the implications for his soul.
As III made clear, he realized too late that he was doomed to a life of regret.
. Yeah but Roth certainly had a huge impact on that. Because of Roth Mikes two capos are gone along with his brother. Yes he still had Neri but his criminal family is not nearly as strong as it was in the beginning. Plus the Rosatos are still on the loose and we are never given an explanation on how that is resolved or if Mike even cares at that point
