You should try playing with other GAFers, infact since IB is going on you definitely should hop onto a PvP train with me and the lot or any one of the trains really.
Personal performance isn't a factor in Iron Banner as we play for fun (and end up winning most of the time anyway), like even yesterday I bought in a PSN friend who never really played PvP and was very reserved about playing it, worried that she might "drag us down" but for the next 2 hours I can personally say that I had one of the best PvP sessions ever because of how much fun it was with the constant jokes and humour...I hadn't had a PvP session where I laughed that much in a long long time.
Plus you learn so much more about the game when you play PvP together, and what's more you can even get some of the IB gear and improve your inventory ! You might even get that thorn bounty done, since you die much less when you are playing together.