On Rotten Tomatoes, the film has an approval rating of 14% based on 69 reviews and an average rating of 4.1/10. The site's critical consensus reads, "Underdog is a mostly forgettable adaptation that relies far too heavily on recycled material and sloppy production."[7] On Metacritic, the film has a score of 37 out of 100 based on 16 critics, indicating "generally unfavorable reviews".[8]