It's quite possible that they cast Kevin Hart and Dwayne Johnson just to make "Little Hart, Big Johnson" pun. As far as buddy cop goes, this contrasting nature can provide some chuckles, however the espionage them might not hit all the marks. Still, there are significant amount of scenes where laughter is secured by sheer timely body language and jokes alone.
Dwayne Johnson plays as Bob, a CIA agent who tries to reach out to his old friend. This escalates into a chase for secret files and national security. The way Bob is presented relies heavily on juvenile gag and demeanor despite his imposing physique, this is fun at first but it hampers the credibility as an agent. The movie wants to add some bullying subplot which is commendable, although it doesn't have the depth to accommodate it.
Kevin Hart is excellent in creating reactions and gestures. He's surprisingly identifiable with high school nostalgia and occasional self-doubt. Many of the good moments come from his outbursts and babbling. The script has a few nifty pop references and sometimes even witty gags, so the comedy is not just slapstick throughout and undermines the "intelligence" in the title.
There are serious undertones of adult life or self-acceptance even though they are not fully fleshed out. Action is pretty light, it's passable without being too demanding. The most important thing is it's enjoyable. Sure, there are a few awkward moments, yet they make the best out of it to present a light humorous spectacle, a better buddy cop gimmick than expected.
