Joker is set in Gotham City in the 1980s. The film tells the story of Arthur Fleck, who lives with his ill mother and works as a party clown. He struggles with a mental illness that causes him to burst into sinister laughter at strange times. After he is attacked on the job and a co-worker gives him a gun, Arthur is fired. Later, he shoots and kills three people on a subway train and gets away. Then the city's social services programs are slashed, cutting off Arthur's weekly meetings and his supply of meds. He invites his neighbor, single mom Sophie (Zazie Beetz), to see his nightclub comedy act. The act is videotaped, and TV comedy show host Murray Franklin (Robert De Niro) airs it, to unexpected response.

I love the acting in this film. Joaquin Phoenix stars as Arthur Fleck (Joker) and Frances Conroy plays the role of Arthur’s mother. My favourite character is Joaquin Phoenix because his acting is so convincing.
I think this is an ideal film for fans of comics and the DC universe. The story is sad at times, but it has lots of action.

I give Joker ★★★★. Go and watch it soon! 

 
★★★★★Fantastic!
 ★★★★Really good!
 ★★★OK
 ★★Bad
 ★Terrible!

(Source: https://www.rottentomatoes.com/m/joker_2019)