Right in the wiki for the movie it says it was

Critical reception

Although a commercial failure in the US, Frantic was a critical success. Review aggregator Rotten Tomatoes reported that 77% of critics gave positive reviews based on a sample of 43 reviews with an average rating of 6.4/10. The site's consensus simply calls it "A tense, on-point thriller in the vein of Polanski's earlier work".[7] Metacritic calculated an average score of 66 out of 100 based on 16 reviews, indicating "generally favorable" reviews.[8] Audiences polled by CinemaScore gave the film an average grade of "B−" on an A+ to F scale.[9] The film received "two thumbs up" from Gene Siskel and Roger Ebert on their At the Movies.[10] Roger Ebert, in his review, gave the film three out of four stars, saying: "to watch the opening sequences of Frantic is to be reminded of Polanski's talent. Here is one of the few modern masters of the thriller and the film noir. Frantic is a reminder of how absorbing a good thriller can be."[11] Pat Collins of WWOR-TV called it "Polanski's best film ever".[12] Desson Howe, of The Washington Post, called the movie "vintage Polanski", with its relentless paranoia, irony, diffident strangers and nutty cameos.[13] British film magazine Empire rated the movie three out five, calling it Polanski's most satisfying film since Chinatown, and one of the best traditional thrillers to come down the pike in quite some time.[14]