In Brink, are there any sniper rifles,
and how good is the weapon customization (IE: MW, AO2, GR: Future soldier, etc...)

There are two sniper rifles, neither are OHK though. Gun customization is good, you can't change the exterior design, but you can put any attachments you want on the guns. I think there are about 4 different slots to put gun attachments, sight, end of barrel, under barrel, and magazine.Not every gun has those 4 though(like the mini gun or lobster). Please someone correct me if I'm wrong.

There are actually just 2, unfortunately: the Drognav and the Barnett. They should've added more sniper rifles. The Drognav has more rate of fire but less damage, rapid fire. The Barnett is really damaging but is a bolt action. I usually use the Barnett though.