I had just beaten the game and got a decent ways into its "end-game". I don't have much else to play aside from Helldivers 2 (and I wait to play that with my buddies).
The game is just not good.
Narratively, it is rather insulting. You get so very little personality from the Justice League themselves or the Suicide Squad. A few quips, but very little in the ways of the depth we had gotten in Asylum, City, or even Knight. The game doesn't even really end. The characters make a quip about how they will keep doing the same thing over and over again finding better loot.
Gameplay wise, it is just generic as all hell. The Arkham series made you FEEL like Batman, living in Gotham. Metropolis feels empty. There is just nothing to do here. There are maybe 2 Missions in the entire game that feel like what players want from Rocksteady, both involved Batman in some way, shape, or form. Almost everything else is the same generic open world mission structure with very little variation. This feels like a generic third person looter shooter with a skin on it. I don't feel like Harley Quinn, Boomerang, or King Shark. The only one I really feel they got right was Deadshot and that is only because he normally uses guns.
The Endgame is piss poor. You do the same tired open world mission structure to get the Resource, P. Get 1000 and you can go do one of three missions each one giving selective parts of the seasons' infamy set. The weapons don't feel all that fun to use or feel like "bane" as he is the one these are based on Apparently. Just a loose skin on some weapons and minor modifiers. Maybe this changes at Tier 3? I doubt it though. Just repeat the same loop, slowly going up in "mastery" (difficulty) to unlock higher tiers until you get the max in Tier 3.
I really wanted to like this game, but they do everything they can to make it so boring.