My problem with Iron Banner way early WOW had the same problem is that the best gear in the game for PVP is available exclusively though PVE. (I appreciate that people that prefer PVE have similar complaints re. the Tower factions, but you can at least get faction reputation via patrols and marks via material turn-ins.) I play PVP almost exclusively and it's galling to know that I'll be destroyed by raiders in Iron Banner, and it won't (necessarily) be due to a skill or communication difference.