"Red" is a rock-'em, sock-'em, shoot-'em-up action movie of the best kind. I must admit that most of the the appeal comes from the appeal of the cast. The plot is intentionally action-movie-typical - unknown bad guys are after the good guy for no apparent reason - so that we can focus on how the good guy will find his friends and get out of his predicament and how much fun the cast will have shooting guns and blowing stuff up.
The good guy is Bruce Willis, who plays yet another Jason Bourne inspired spy, except this spy was in action long before Jason Bourne was even a twinkle in his father's eye. To get himself out of his mysterious predicament, he hits the road and recruits his other retired spy buddies. It's a given that the casting and writing all borders on being stereotypical. But it's all done with enough panache and tongue-in-cheek that it can be forgiven and enjoyed.