Here's some feedback for you.
I now have to use many more troops to destroy buildings that I don't want to destroy, just so the wall breakers don't attack irrelevant walls and actually have a much better chance of penetrating a base as far as the storages usually located in the middle. So far, pretty much every time I have tried to do this I have come out second best with less than half or possibly even a quarter of the resources available. Sure, my attack strategy is probably flawed in some aspects, but the new wb targeting certainly doesn't make the task easier, quite the opposite in fact.
Previously, I could destroy maybe the first 3 - 4 buildings where I was going to deploy wall breakers, I could then account for spikes and other defences and penetrate more often than not, a nice straight hole into the base. Now I literally need to clear almost the entire side of a base, just to ensure the wall breakers don't run off to the other side of the map and of course die before they even detonate.
I appreciate what Supercell has tried to do. But at the moment, it's proving more difficult and a LOT more frustrating than I think it should be.