Critics are hard on this film because it is a betrayal of the Warner Bros. Looney Tunes/Merrie Melodies spirit of parody and satire. No one at WarnerMedia cared about skewering itself–The Simpsons and Fox, anyone?–so the movie has way too much product placement done in the name of homage to more than 50 years of entertainment. The goal should be to generate laughter at the expense of the product and the studio, not to humble brag about how you have the world’s minds on lock.
P.S. See below for a classic example of Warner Bros. making fun of itself.