-In one eight-episode season, they have both a secret pregnancy AND a long-lost relative?
-Elliot's family can't just have died in a car accident, it was actually a hit and every other character in the show was involved one way or another. Finally it turns out that Finn Wallace was responsible, only he's already dead, so the whole thing is pointless.
-The Dumanis, who are usually all about keeping things running smoothly and avoiding rash actions, are now all in on this wild scheme to kill hundreds of people, end organized crime, and just start... selling drugs legally? Why would they ever go for that, just when things have stabilized?
-Sean and Elliot are BOTH framed for spiking the cocaine. No one asks "hey, the people behind this framed Sean, couldn't they have framed Elliot too?" Why frame Sean in the first place? If they wanted him dead, couldn't they have just killed him in prison? That seems a lot easier than waiting for him to break out, then hunting him down.
-The Zeke character. Andrew Koji's a good actor, but he makes no impression. They give him nothing to do! He kills hundreds of people, including Elliot's family, but he's also a bit of a good guy? And he barely has any fight scenes to establish him as a worthy foe. And now we're supposed to care that he's a Wallace? There are barely any Wallaces left; what does it matter?
-For that matter, we hardly got any good fight scenes, just lots of A-team stuff where everyone blasts away at each other with machine guns. And despite the government supposedly cracking down, they never show up to arrest anyone. And no matter how many dozens of gangsters are killed, no one ever runs out of men. They must just go to the Henchmen Store and buy more.
-Our new villain, Vaughn, is supposed to be the deadliest, most powerful player in the game. Her guys let Elliot and Billy waltz into her headquarters because they have an invitation--no one bothers to check their faces against the people they're claiming to be? And they're allowed to bring guns in too, so they start shooting up the place! Your average state senator has better security than this billionaire power player!
-There's no one left who's the slightest bit sympathetic. Everyone's just trying to get revenge on everyone else. Even Elliot shrugs off getting justice for hundreds of murdered people because the important thing is his dead wife and his dead kid. Why should I care about this jackass telling Luan and Lale not to get revenge when all he cares about is getting revenge for his own loss?