This movie is meh at best. The plot is so-so. This isn't anything to write home about. You could make it into a B-Movie and no one would care.
No one likes Training Day for Training Day... they all just love Denzel Washington's performance in Training Day, and that is just an honest fact. 
The movie wouldn't be anything if he didn't deliver and what he delivered was so sensational that people are going to be talking about it decades after we pass. And that is what people like. They like how deliciously evil Denzel was in the role. They like that he had free reign, as a villain, to make the role as memorable as possible. And he did, he knocked it out of the park.
So now, people watch Training Day, but let's be honest, they are only watching it for Denzel Washington, and that is as it should be, he was stellar in this, he deserves the recognition, and it's one of those movies that is otherwise so meh that his performance just shines out as the only thing really great about it.
Even this rating, 10 out of 10 stars? It's not because the movie was good, it's 100% based on Denzel Washington.