In 2015, Lebron was HORRIBLY inefficient during the whole playoffs. He didn't have one game against the Warriors in 2015 where he shot above 45 percent. While he scored a ton of points and we grinded out those two wins with hustle and D, the Warriors still prevailed because Igoudala was good enough to stop him ENOUGH.
In 2016, lebron was atrocious in games 1 and 2. He also took less than 25 shots in both games. In Cavs victories, games 3, 5, and 6 Lebron took 25 shots with a field goal percentage of 52% or higher. That is INCREDIBLE stuff. The Cavs got very lucky that game 7 came down to a total war of attrition where are all of the major scoring stars outside of Kyrie were having very inefficient games. Thompson, Lebron, and Curry were all terrible. Kyrie was very good and Dreymond Green had the game of his life to keep the game from basically being a comfortable Cavs win.
In 2017, I think the series will once again rest on what kind of Lebron we get and what kind of usage he has. If he shoots 55% percent with 25 plus field goal attempts to go along with 8 assist and 8 rebounds then there really isn't any kind of performance by the Warriors that is likely to overcome that kind of thing. Lebron is pretty much the only player in the world that can have a 40-10-10 game on 55% shooting.
However, if the Warriors make his very human like in 2015, then I don't see how we can win. There's no way we will defend well enough to win a defense first series.