A lot of the people who complain about pvp hacks usually throw the blame to more skilled players...i have myself been accused of using speed hacks just for leap frogging from cover to cover with my sniper, i highly doubt that there are many hacks out there, i pvp pretty much every day and i have never seen anything i thought could be a hack of some sort.
i have once experienced lag issues which me and all my team mates experienced, choppy frames etc then the other team planted on voidstar, this could just be a matter of connection issues though.