OK, sent several large surface combat fleets to attack a hex I thought my opponent was heading too, but I guessed wrong, and they got hammered by air attack in the process.
However, I had all the fleets with very high aggression comanders and "React to enemy" set to 4 hexes. My opponents actual target was within a couple of hexes of the path of my fleets, but despite plenty of floatplanes on search (at least 30) they did not react to the sighting. Is this working as designed? The only ships that seem to react to threats are PT boat Tfs.
PS> Not trying to blame the game, it was a screw up of my own making, I thought in the back of my mind before I sent the turn that they might react the right way if I choose the wrong hex to attack.........
a couple of SC TFs were enough to totally kill off all my fleeing ships from the Philipinese, it was bullet prove. And from my experience in something like at least 90% of the time the mid ocean intercepts end up in engagememts. That´s my subjective experience though and not any testing. For me, it´s far too effective as a 45 mile hex is still quite big and not every single small AK or PT should end up in a fight with the hunting SC TF, especially at night.
So yes, it definetely is working, especially the magic spotting - reacting - engaging - killing routine at night. That´s what really makes me thinking about it, because I wonder what magically spots the ships a couple of hexes away. In my PBEM, everytime one of my ships ends up within a couple of hexes of a Japanese SC TF the ship is dead. I really liked the new feature of mid ocean intercepts, but as with many things, it´s just too much now. They happen far too often and the chance not to have an engagement is far too small IMO.