It helps to start off with someone else healing initially to get your 5 wins. I had a priest with 4k+ resi heal me and we had a reasonable win rate when my dks were between 1.5k-2k resiliance. A significant win boost was levelling up engineering for the heads and glove enchants. I'm playing now with my pally and i'm not doing amazingly 1550 rating (in my book anything over 1.5k is good) but i did go 5-0 this week, don't have time to play more games.