only thing I can tell is who spent money/really lucky and those that haven't... i.e. ones that have a high level poe and other characters and ones that don't... Beyond that all it's told me is who is easier to attack which is more informative than the straight power ratings...
But yep doesn't stop people from attacking you if you field a weak team or one that lacks synergy...
If anything I lost the surprise that was waiting for me when I attacked a team... Now I know exactly what to expect every time.. which in my view is boring..
It hasn't changed how I deal with groups, all it's done is change who I am more likely to attack... i.e. easy wins over difficult ones