I'll just continue to insist it's never a 4 on 1. And the way invasions are now the Sentry is useless. They mark an invader only doing damage to them. So either they get some wild lucky AOE grenade to catch the invader or they're dead when they engage. Invaders have so much power, shielding (even more now with their set) and constant element of surprise that it's ridiculous. It's stupid, they're terrible and that's my opinion. I literally hate getting killed by them more than any player in pvp because at least that's on more or less of an even playing field.
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If you are on a full team it is 1v4 unless your team invaded. It's usually pretty easy to kill the invader before they even get going unless they spawn behind the damage circle. That's were planning and communication comes into play. Send the sentry one way and your invader the other, now on of you are behind the invader, if he goes down the middle you have a reaper and collector waiting and the other 2 are both behind him. People panic and scatter, I see it all the time when I invade but the coordinated team usually takes me out very quickly.