My biggest team I've taken out solo was 4, and that was mostly luck as I'm not that good at PvP to put it nicely!
I was full iron, stone sword, and they were a variation between leather and iron, with bits of chain and gold, but all stone swords. I was running up above them, they didn't see me. I got a shot with the bow on each, then jumped down and crazily hit and spammed my sword and block hit too. Boom one dead, then another. The other two run off in the same direction. I kill one with an epic headshot and the other after some epic strafe skills, dies to my sword. Good thing this wasn't when I was a mod, cause they all accused me of hacking!
But, the best part is that I didn't even win the game. *shakes fist* Hackers!