I didn't review Parasite when it first was released. It was on a full boil of enthusiasm elsewhere. I left it percolating. [I had previously written a negative review of Bong Joon-ho's Snowpiercer (2014).]
Ann Hornaday pretty much has said what I think about Parasite: "Parasite... manages to be an intriguing, if plotty parable..., before it devolved into a Grand Guignol of hyper-stylized violence, leaving a bloody pile of glib dichotomies and muddled morals in its wake."