Playing on GP since 2 season. By the first look on this new GP I was so sad but that was like old people dreaming about their young ages so everything new that they see they can't "breethe" as well as new ones can do.
But I love GP so I made a second look on it and you know what? He started being really interesting champ. Do you remember old critplank and more older atma+warmogplank? Yes, they was op but they wasn't such interesting as the new one.
Every champ is good if you l2p on him but captain makes really tons of damage. Previously you shouldn't build such damaged GP but not more attack = more barrels damage. Really insane champ. Now yhou should think what will you do in the next second. New feel if you played on GP before (e+r+q attackattackattack w).
You can build some tacticz by using barrels+parrley.
Here's some of my games to show you my usual build and build which I've tried against tanky Garen.
I'm playing in gold division so I don't know what you build in plat+ but in this hell I'm playing this build is pretty good.