If you're going to use Double Dragon, why wouldn't you use Druddigon, which has way more power. CB Outrage does 41% - 49% to the most defensive Klinklang ever seen (not divulging the EVs because its my personal spread) which is REALLY solid damage, and it gets Earthquake which obviously wrecks it. It also does 58%-68% to max/max bold Weezing, which is really nice.
I disagree 100%, you can pretty easily play around it since: all the spinners are weak to SR, Klinklang is dominant in the metagame and wrecks everything on a hail team except Slowking, and CB Sawk punches huge holes in teams because again, Slowking won't be around forever. It's a decent-good team archetype, and when built right it can be a pain in the ass. However, broken it is not.
In fact, I don't really think anything is outright broken in this metagame. There are no threats that you just have no answer to, unlike say Yanmega in RU or Kyurem in UU. However I have a feeling that when the tiers update on January 1st, we're going to be dealing with a bunch of mons that are about to drop from RU. But that's still a month away, so let's enjoy the balanced metagame while we can!