Jackie Chan supposedly retired from acting several years ago, but occasionally makes a movie to fund his various causes. It sure looks like this is one of those films,
Chan is Luo, a special forces soldier rescuing villagers from a war torn area. Cena is Chris, a former special forces soldier who gets mixed up with his brother's mercenary friends and crosses paths with Luo. Once Chris' brother is killed, he teams up with Luo to get revenge on the one responsible, Paddock (Pilou Asbaek). There are a lot of fights, lots of jokes, and silly (and goofy) scenes. Its obvious Chan is getting a little old to be making these movies as there are a lot of jump cuts in the fight scenes as opposed to long scenes of Chan doing amazing stunts. Time catches up to us all.
There is nothing new here that wasn't done better in Rush Hour or Shanghai Noon. Despite its definitive unoriginality, the movie sparkles because of its leads. Cena and Chan are likeable and have enough screen charisma to carry the film...barely.
Its not a great film, but its a fun way to spend 100 minutes.