Weak plot (spoilers)
Like many have said Denzel was only thing worth watching in this film.
Connie Nielsen did an adequate job.
Pedro Pascal's General Acacius was unconvincing, he did not look like a general soldiers would die for, someone with a commanding presence and authority.
Paul Mescal's Lucius was the weakest part, Macrinus kept saying there was a rage, fury, in him, that is why he was invincible. But I just don't see rage, I see a laid back guy, articulate, well educated, did not even look sad to be a slave, did not look that sad after his wife died. The only time he was even upset was seeing his mother.
Russell Crowe has this intensity, Paul Mescal just doesn't.
How did Lucius grow up? He was well educated, probably had a decent up-bring, then why he hated his mother so much?
He basically became the leader of gladiators, how did he gain this authority? I don't really see leadership in him, so that was not well explained or developed.
Didn't he want the entire Roman army to die? Then soon after he talked about a Rome he wanted, since when did he start thinking fighting for a free Rome? And commanding the army killed his wife?
It is just weird.
I can't put too much blames on the actors, they are given an script don't make that much sense.