The numbers don't lie regardless of who's on the court with him. This kid is a player.
The only valid reason I can see for questioning the legitimacy of his numbers is the fact that Minnie actually traded for HIM. Minnie's track record in the draft and with trades is SOOOOO suspect, I can see where someone might question how good this kid is. 
Well if you don't play with any good rebounders you are going to get more rebounds. And if you don't have anyone else who is a good scorer you are going to score more points, because everyone can hit shots and someone has to. So in that way his numbers aren't quite legit. Sure, he put up 40 points but would you say he is as good of a scorer as 40 point type scorers like LeBron, Wade, Kobe, or Carmello? No.
It's the same thing with Beasley, look at his numbers. Everyone called him a bust on the Heat because he didn't score and though he has improved this year, he is putting up way better numbers on Minny mostly because they need someone to score.
All that being said, Love is a legit player and one of the best rebounders in the league. It's just his numbers aren't legit in how they are inflated, if he played on a better team he wouldn't get quite the stats he does now.