Lol, what does field goal percentage and points per game have to do with who's the better scorer? It may seem that way to the average ignorant fan, but true basketball fans know there are way too many variables that go into statistics like that.
For instance, Wade and Lebron's game consist of going to the basket aka layups over 50% of the time, Carmelo's game consists of mostly jump shots. Conclusion: Field goal percentage determines shot selection mixed with shooting ability.
Points Per game determines your role on your team. Some people need to score 30ppg for their team to win, others need to score 22ppg for their team to win, still doesn't determine the better scorer. All it does is give the observer an idea of how much of the team's offensive load you put on your back, usually determined by your coach's style of play, your playing style, and the other talent on your team.
P.S. The fact that you thought "go check the stats" was a valid rebuttal, shows your ignorance towards the game of basketball. I suggest you educate yourself a little more before trying to debate on a topic you have little knowledge of.
Cosign. I also watch most of Carmelo's games, and yes he has improved his court vision and his defense.