I had great success at level 50-59 WSG and AB. At that level you blow people up if you have 3 or more toons. There is nothing better than Pom Pyroing twinks with high level enchants at that level. Once I got 50 wsg marks and 90 ab marks I leveled up to 60. I plan on doing some bg's at 69 for EoTS marks. I am not sure how that will be but lvl 59 was great.