Very Disappointed In Action Scenes

A friend highly recommended this film to me, so maybe my expectations were too high. But, I did not believe that a man who would confront multiple men armed with knives, pistols, machine pistols, and assault rifles time and time again with no weapons would survive a single encounter, never mind battle after battle. If you hit a big guy with a submachinegun with a book, would you really come out on top? Is Denzel's skill as an unarmed fighter better than Bruce Lee's, or even close?

Ya, I know, it's just a movie. But, I found these fight scenes to be totally unbelievable. They weren't even flashy.

Anyone else feel this way after watching the movie?