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Critics Review
2.00
Well-intentioned but Nayanthara's film is lost in execution, authenticity
Even with convincing performances from Nayanthara and Ritwik, O2 falls flat. It gasps for authenticity and plausibility.(more)
Source: Ashmeera Aiyappan, Firstpost.com
1.50
Nayanthara's O2 could have been an interesting survival thriller. However, the film falters to a larger extent because of its uninteresting screenplay.
O2 is also a film that shows that audiences are taken for granted. When all the other characters in a particular scene gasp for breath, Nayanthara doesn�t. When the end is near, Nayanthara�s Parvathy hallucinates and feels breathless due to lack of oxygen. Finally! Some of the altercations between bus passengers are so lousy that it makes you roll your eyes.(more)
Source: Janani, India Today
2.00
Nayanthara�s film is a decent survival thriller uplifted by good performances and cinematography
O2 is a film that is good but could have been great. It had the right ingredients but suffered in parts due to flaws in writing. But owing to its performances and camera work, it still ends up as a good attempt by a first-time filmmaker.(more)
Source: Haricharan PUdupeddi, Hindustan Times
3.00
NAYANTHARA SKILLFULLY SHOULDERS O2, AN OKAYISH SURVIVAL THRILLER
O2 is interesting in parts, but could have been much better. (more)
Source: Logesh Balachandran, Times Of India
2.50
Nayanthara's Survival Drama Is Ambitious, But Misses The Mark
O2 is one of those films that begins on an ambitious note with an interesting premise, but misses the mark. This Nayanthara-starrer ends up as an underwhelming, passable film.(more)
Source: Akhila Menon, One India