I'm noticing a lot lately, particularly on Hanamura B, that the defensive team will stack a couple of Torbjorns with a Bastion. Their remaining team comp will usually be a healer, some sort of harasser/flanker to keep people from taking long-range potshots, and then probably another harasser or a Reinhardt to shield the stationary defense.
I'm finding these sorts of defensive compositions incredibly difficult to beat, assuming the enemy players are competent. It's difficult to take out the Torbjorns first because they can decently hang in the back and hide, and taking out their turrets usually only buys you seconds before the next turret is back up. Even peeking out to snipe at them with Widow/Pharah/S76 is tough because with 2 turrets, you get shredded quickly. A Reinhardt on offense can help but Bastion can shred his shield pretty quickly, not leaving a lot of time to take out the turrets/Bastion before you're under heavy fire.
In particular, when playing against this on a PUG, it can be very very difficult to coordinate an offensive strategy to deal with it. That said, I'm not even sure what kind of offensive strategy to recommend or how to deal with it if I'm in a group of friends willing to cooperate. What's the best way to bust up this kind of defense and capture the point?