Dwyane Wade is arguably one of the best players in the NBA today. It's hard to peg down what position he plays, as he can play a little point guard and a little 2 guard. At this point, I think it is safe to say he is a 2 guard who handles the ball.
Wade is averaging more assists than most of the league's point guards, so does that constitute him being a point guard? Mario Chalmers and Carlos Arroyo play opposite Wade, both players are fairly traditional point guards, so it may be a safe assumption to say that Wade by position is a shooting guard.
But what makes a point guard? A guy who handles the ball? Someone who sets up and calls plays? A guy between x-height and y-height? A guy who averages x-assists per night? A team leader?
Perhaps a player that is solid in pick-n-pop/pick-n-roll situations? Good three-ball shooter? Fearless at attacking the basket?
Its arguable that all of these things are factors in determining what a great point guard is, except probably the height factor and specific skill sets mentioned. Magic Johnson was 6'9" and no one was questioning if he was a point guard or not. Same goes for Penny Hardaway, he was 6'7". Is there any correlation between freakishly tall point guards and nicknames?
An ideal point guard can defend, pass, shoot and attack the basket. But I suppose those are qualities you look for in every player, but a really good point guard embodies all of these qualities. A solid point guard is multidimensional and shows these characteristics at some point in time in their game or arsenal.
As for the upcoming list, this is based on the players stated position by team officials and by others in the league. And this is purely my opinion, not written as Gospel, so keep that in mind. Here are some players that are playing well, or have played well, but just aren't quite there.
And now the top 10 point guards in the NBA: