This movie for Denzel Washington is like "Jack Reacher" was for Tom Cruz. The theme of the movie is the tried and true action movie theme wherein a "retired" highly trained agent/operative/soldier/detective/etc. . . trying to cope with the demons from his past overcomes his PTSD by coming out of retirement to fight for those people who can't help themselves, usually little girls/old ladies/wrongly accused/etc. from the evil bad guys usually engaged in drugs/prostitution/gun running/slavery/patsy/scape goat/etc. . . through an ever escalating display of the "special training" to right the wrong. If that theme appeals to you, this one is one of the best if seen.
Thus, for all those that have criticized the cliche theme of the movie, the movie is not the problem. You are. You either ignored the trailer telling you what to expect or watched the trailer and were, idiotically disappointed that the advertisement for the movie delivered what it told you it would. A piece of advice. Don't watch genres that your tired of or weren't really interested in at all. If you do and then don't like it, it's your fault, not the movie makers. Giving a low rating on a move because of your ignorance just reinforces what you are