Action is a genre that hinges solely on entertainment value. Even if it's a blatantly dumb plot and objectively not that great, something like Machete or Bullet to the Head, you can still have fun watching it and appreciate it for its pure insanity. MI-5 lies on the opposite side of the action spectrum. It tries to be serious and dark and much smarter than it actually is. This sucks the atmosphere dry and leaves you with a bland, brooding, and tasteless thriller with little to no thrills.
The movie starts off with a criminal escort gone wrong and develops into an espionage mission that can only be done by a specific agent who was kicked off the force, Will Holloway played by Kit Harrington. I can't fault any of the actors here because these characters are paper thin. They're just either giving orders or receiving orders or having secrets meetings or reciting some other form of lifeless expository dialogue for a majority of the movie. There's no chemistry between anyone, they have no development whatsoever. It just doesn't look like anyone is having fun. And with a script like that, how can you blame them.
There is a sleek, glossy feel about MI-5, which is one of the few positive things about it. Kit Harrington is a badass in general and it's nice to see him in a modern action setting. Unfortunately, the action in this movie is so scarce and underwhelming, it's hard to even call it an action movie. Instead of exciting action sequences, we're left with cliché double-crosses and triple-crosses and back stabs that no one cares about because none of the characters are engaging in the first place.
MI-5 is kind of like background music. It's not gripping and won't get your adrenaline pumping, but it's quite harmless to have on. It's just completely run-of-the-mill, linear storytelling that takes a page out of every spy book and streamlines it all into a two hour film. Kit Harrington can certainly be an action star, but this is not the proper vehicle to showcase his talents. MI-5 is a miss.
