Metacritic reviews

Many comedies fall short, putting wit on hold to fulfill the necessities of plot. Here, however, plot simply provides a destination and a deadline. This film races with such high energy that the humor continues to satisfy, if only because the characters are so likeable.

Lost in Thailand is a boisterous, joyously hokey comedy.

Zheng errs on the side of improvisatory and lazily assembled Apatow-esque narrative episodes; many of those scenes are amiably goofy, but it all holds together based on his cast's charm and energy.

While the exact secret to the film’s high-grossing recipe remains a bit of a mystery, it probably has to do with the good-humored chemistry between the unlikely partners, pushing the limits of censorship in the sexual-innuendo department, and a well-written off-the-wall script that makes audiences laugh out loud.

By our quote-unquote standards of contemporary comedy, it plays as uneven at best and often just flattens out for long jokeless stretches.

Like many broad successes this unremarkable movie proves decidedly reluctant to yield any golden secret to box-office bonanzas, unless you count tried-and-true chase formulas and a moral about rethinking priorities.