Most of the player base at later times in the day (North America Times) are very toxic, consisting of players whom think losing a BG is a defining moment in their life. Taking that loss out on every player they queued with by either quitting the BG early or standing in the GY talking trash in what seems to be a form of English to their teammates. Blackrock has turned into the kiddy pool you see at the public pool..
You can't expect a non-toxic playerbase in an INSTANT server. You also can't expect a decent BG experience in a mostly strictly arena server. I didn't even know anyone queues for them anymore