Oh behalf of the online multiplayer community, please accept an apology from me for the actions of those two cretins. I think most of the regular Sins players who are experienced are good folks and we're not all jerks.
I also think that most of the experienced players will honor a request for new players game. When this sort of thing happens, as soon as it becomes clear that the other two guys are experienced smurfs, I suggest just typing out something to the effect of, "GG noob killing smurfs, not good enough to play against JJ?" and then have you and your ally just quit, denying them any further satisfaction.
It's a shame that you want to play online in principle but can't make it work. I do have some ideas for ways to make it work.
First, I know of a small group of adult folks who enjoy playing by direct IP connect, off of ICO. They'll make an effort to keep the team's balanced and they are welcoming to newer Sins players. Just send me a private message with your gaming email address and I can hook you up with them.
Secondly, you could try to get organized here on the forums so that you have a self-regulating community within ICO. See this thread:
Don't let the jerkwads chase you off of ICO. Hang in there. I see games all the time that are passworded or restricted to friends only, so there are ways around this problem.