Many of the advantages around it comes from the specialized technology you can use to sneak around the area like the Tactical Cloak, making them stealth specialists in the game, and with a smaller quantity of combat skills to take care of, you can focus on building your ways to catch enemies from the shadows. The Infiltrators combine some of the best abilities from an Engineer to control and manipulate machines, along with the use of sniper rifles that let you finish with the enemies around from a long distance.
(Picture: BioWare) Mass Effect Legendary Edition: Infiltrator