Blame the honor system, not the BG or the players. People chasing ranks, and fast AVs is the only way to do it. Why would I spend 1h in a bg where after so many kills the 40 players I encounter give 0 honor and all the leutenants and commanders are dead when I can get 2.5k honor from leutenants/commanders every 10 minute game we lose? The honor system is designed in such a way that it incentivizes fast, efficient games. The result is irrelevant after the game lasts 20 minutes because anything longer than that is typically a stalemate and bad for ranking.