User blog comment:Dragonzzilla/ME3 Multiplayer DLC I Ideas/@comment-4967682-20120430025126/@comment-4967682-20120430061631

In that way they'd be sort of the antithesis to the geth- the master of shields who excel at close combat but suck at knocking you out cover (that's why farming against them on Gold on Firebase White works so well). The Collectors would be the master of biotic barriers who are great at knocking you out of cover but have no real tough short range unit (except Harbinger-stand in, but that's just because you can't dodge his Warps or Nova) and are pretty good everywhere else.

Also, I'd recommend putting that description of Swarm Grenade in the description of the Drone, and removing the thing about the barriers.