Ask 15 people to rank the top 15 players in the NBA, and you'll get 15 different lists—so you're destined to disagree with mine.
What's my ranking criteria? Statistics, consistency, durability, a style of play that's conducive to team winning and mental toughness. If I have a choice between a high-scoring hog and a selfless, solid two-way player, I'm taking the two-way player most of the time. Of course there are certain rosters which require a score-first leader (can't punish them all).
Generally speaking, I believe that winning basketball is the result of collective rhythm, which can only be established through unselfishness and high on-court IQ (i.e. the Heat and Spurs).
I don't see the need for any more of a boring introduction, so let's just get to the good stuff.