Is Nemesis-Meta pretty much already figured out?
I played a few games of the mode today with my friends, and it got pretty boring pretty fast.
The reason is that deciding your enemy teamcomp makes it too easy to create counterplay in your item choices.
All we did is give the enemy team melee tanks with little gap-closing ability, and built straight Borks and Liandry's everygame. We more or less just steamrolled our way through every game.
for example.
What have you guys been picking for your enemies? Because I honestly can't imagine a more universally worthless team for the enemy. As long as you have any sort of kiting ability or synergy with Bork/Liandry's you are basically guaranteed to win any straight up fight. Especially if the enemy team gives you any champion that can somewhat be considered a carry.

. Very minimal CC to lock down a rampaging Vayne. Kinda funny considering the person they gave Vayne to was someone who had like 800 ranked wins with her last season.