I dont think boosting applies, in COD ppl mostly boosted to get Killstreaks, no Killstreaks here
and since the win or loss replies completely on objectives killing your friend over and over wont win the match (which is also why Stats wont cause any of the problems you all are afraid of
)
Boosting in Brink would be more like power leveling in a MMO, you'll get to the level cap with none of the experience thus making you no different than when you started, a noob who doesnt know what hes doing
Also since you always have the same character it would be easier to be cheap and "boost" in a private match or somthing rather than MP, so shouldnt ruin anybody else's gaming