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On Rotten Tomatoes the film has an approval rating of 49% based on reviews from 149 critics, with an average score of 5.34/10. The site's consensus reads: "Though it may seem like just another Harry Potter knockoff, Percy Jackson benefits from a strong supporting cast, a speedy plot, and plenty of fun with Greek mythology."[23] On Metacritic it has a score of 47 out of 100, based on 31 reviews, indicating "mixed or average reviews."[24] Audiences polled by CinemaScore gave the film a grade B+ on a scale from A+ to F.

Kenneth Turan of the Los Angeles Times described the film as "standard Hollywood product... unadventurous and uninteresting".[26] The reviewer for The Washington Post thought "the movie suffers by taking itself a little too seriously. It's not just that it's a lot less funny than the book. It's also a lot less fun".[27] On BBC Radio 5, Mark Kermode criticized the similarity of the film to director Chris Columbus's Harry Potter films, likening it to a Harry Potter parody book and dubbing it Benjamin Sniddlegrass and the Cauldron of Penguins.[28] This comment later sparked a satirical fan creation with precisely that title, narrated by Stephen Fry.[29]

The author, Rick Riordan, publicly criticized the final script. He revealed email recommendations for script changes with names redacted. Regarding future support for a reboot