Formations really force to change your game a bit, I guess people are not very used to it yet.
Stacking against tank was the successful strategy that we used for a long time for the best win ratio, long enough probably to forget what the win ratio used to be before it.
Now it’s no longer the most successful strategy, at least not the same as it used to be, but we’re still getting used to it, and still figuring out what the new strategies should be, what kind of heroes we should work on etc.
It’s a bit of a gamechanger, but I like it, it was long time due to introduce a drastic change like that to the game mechanic to refresh it a bit. Natural reaction is being annoyed by losing more often, but overall I think changes like that are necessary to keep the game alive and I hope for more to come.
*I personally went back to raiding rainbow only and I am having a great time using heroes I never thought I would use before. And finally thinking about whom to pick for each match and how to compose a team matters more than just taking all my maxed&emblemmed legendary red heroes against green center regardless of anything else. It was effective but boring like hell, and super prone to bad board frustration.