I hear you, but I would like to clarify something - a top team is a top team no matter what battlegroup you play on. The undeniable fact is that BG9 offers more of said teams to play against on a day-to-day basis. Only fucking retards who jump on the trash-talking bandwagon will say ZOMG YOU CAN'T BREAK TOP 20 BECAUSE WE'RE AMAZING. I don't blame you if you think BG9 is overhyped, though. Mob mentality turns people into parakeets that repeat every god damn thing they hear.
If you want to become, say, the best chess player in the world, you need a constant supply of skilled opponents to practice against. The more, the better. It's the same thing here.
I also invite anyone who actually does have doubts about BG9 competition to log into IRC and just send a friendly PM to any of the players on the top teams that transferred here and ask them their thoughts on this subject. You will be hard pressed to find one who regrets coming here or thinks that BG9 does not offer more good teams to practice against.