I'd go with either a spas loadout(explosive focus for survivability if i have) or Stealth + arc and walk around and hide for a good opportunity, and try to capture a control point.
Problem with the arc is that it's tough when the other team has complete control, and you can't really leave your teammates alone. It kind of feels like you're abandoning them... since that's how the rest of the match will play out.
And explosive focus spas....yeah. You get that speed, and that ability to take other dangerous loadouts on. And you can't forget a trusty flash 'nade.
If I really care, which most of the time I don't, I turn on my super boss mode where I pull out my aegis, capture every bullet fired at me and throw them all at one person. After which I proceed to kill the rest of the team with flash grenades. It's a horrible sight to see.
Pseudo-official Co-'Pun'-isher of the Conduit 2 Board. Free-Lancer clan FTW! Too bad you can't join. http://cdn.memegenerator.net/instances/400x/23206541.jpg