"Mercury Plains" is one of those films that in order to succeed just needed fifteen rewrites of the script, at least, to become something truly good or more than just watchable. But nope. This is just like the junk food industry: fast, simple, cheap, somewhat digestible, never healthy or sustainable but it works to some, though the real thing never convinces.
With a more experienced writer this is the kind of plot that could work easily but here someone is making us force to use our suspension of disbelief to the max, and that's just wrong. Scott Eastwood plays a troubled guy with no prospects in life who runs away to Mexico along with a friend to get some cheap fun and thrills. Somehow, he gets recruited by a man called "The Captain" (played by Nick Chinlund, quite okay) who runs a paramilitary group who fights drug cartels. The group is formed by teens, kids and weird types who barely know to use a gun, but they're the ones taking over the place of the real cops and making things right. And as usual things go south, things are not what they appear and Scott is gonna be the real hero of the situation.
Effortless in action, mildly interesting scenes (the final conflict was good but the result from it was a real mess. Epic plot hole). If the idea of the movie is to serve as a pamphlet to paramilitary groups to deal with the drug problem in Mexico, then we're in big trouble, boy. Just goes to show that amateurish folks acting as if being real law enforcements, fighting against real dangers, cannot succeed in any way (unless those groups opposing their own governments in Latin American nations during many military coups between the 1960's and the 1980's. They had some powerful effects against organized movements).
A passable movie due to Chinlund's usual and nice effort as a villain; and Eastwood providing a suitable heroic look even though he's taking too much out of his daddy (silence and expression) and not doing anything creative. There's still time for him to become a real good actor. Except for the fore-mentioned reasons, some scenes here and there, "Mercury Plains" is just for desperate curious minds but you can go without it. 5/10