Although he put up much more efficient numbers before his foot injury, here are Brooks' rookie year numbers, with the 2nd year numbers of a current NBA player.
29mpg, 12.6 ppg on 43/31/76% shooting, 3.6 rpg, 2.3 apg 2.1 TOpg
26mpg, 15.4 ppg on 43/34/79% shooting, 3.1 prg, 2.5 apg,2.0 TOpg
That player is Kobe Bryant.
Now, I am in no way saying that Brooks is even a destitute man's Kobe Bryant, but his reputation as a useless chucker is way too premature a yoke to hang on him.
The guy has good NBA size and athleticism for his position, and is a hard worker who has improved every summer for the past four years. The only way to know if he can be a solid contributor on a good team is to see him play on one.
Brooks was the 25th pick in the 2011 draft and made all rookie second team. I can't believe that he's not worth a pick in the mid to low 20s. Being from Providence, I've seen Brooks develop his game from a nothing to a top scorer in the Big East, and then a solid rookie in the league, albeit on a garbage.
I have faith in the guy and think he'd thrive as a Celtic. I expect Brooks to be a more efficient scorer this season where ever he plays. There are plenty of instances of good SGs not being that efficient their rookie year. Kevin Martin shot 38/20/65% his first year.