I think seeing the attackers is awesome! GMAC, Carlos, and Kamuz - please attack me
Or not.
I agree with everything most have already posted, with GMAC leading the charge . Defense copying is inevitable as we see what works and doesn't work from direct experience. But with this new feature creativity is squashed - all your cards are shown - and offensive copying is now enabled. There's no reason for it. Yes - you can see what compositions broke your defense - but because defense is static there's simply no way to defend against everything, so I don't see it as overly helpful. In my opinion the value of crafting a fast, effective offensive that may give you a competitive edge is crippled when you can see the top players playbook plain as day.
Now everyone is a Bill Belichick (my apologies to Patriots fans)
Just like having Jofers toons won't give someone Jofers speed, seeing GMACs team will not let them stop GMAC. But it's just one more ingredient towards a game with homogenized teams - and that's a really bad thing.