I haven't seen "Training Day" all the way through, so my opinion may not be worth much, but I feel like it didn't age great/others have done similar things better since then. I could see it still being a fun movie to watch tho. Traffic is another older drug movie that's still a good watch.
This isn't on netflix, but the recent movie "Sicario" is great and definitely worth seeking out. In parts I feel like its almost a superior, Mexican drug war version of Training Day, but again, I never saw that movie all the way through, so I could be way off.
Emily Blunt is great, the subject matter is super interesting, and the scenery shots of Arizona are gorgeous. I was hoping for a bit more of realistic approach, but that's mainly personal preference, cause the movie still does a great job for a major film. Definitely recommended.
Again, "Sicario" is not on netflix, but if you want to see an even crazier drug cartel movie that is, check out the doc "Cartel Land". It's primarily about the vigilante groups that developed in some areas, to combat the cartels. Some of the footage the filmmaker got is insane, and the primary vigilante leader is a pretty intriguing narcissist.