Sicario is a high-octane, yet grounded story of a black-ops mission with new and interesting characters. It's one of the few movies that I wouldn't change a thing about it.
Sicario is the story of a by-the-books policewoman who ends up working for a black-ops team. On the grand scale of things, one could see it as a fish out of water story; but it's more that. There are some characters that you see in other movies as well (e.g. Josh Brolin's character who recklessly runs the operation from the shadows), but the characters played by Emily Blunt and Benicio Del Toro were different from characters that I had seen before.
Besides characters and acting, the direction of the movie, some of the cinematic shots, and the score, all complemented each other perfectly and created a new experience - I felt like I was in the field with them.
I am not saying that Sicario is the cinematic masterpiece of the century, but it's a very fresh take on an old genre, and the filmmakers delivered a perfect product; perfect not in the sense that it is better than other films in cinema history, but a film that was as great as one could possibly make in that genre... Needless to say that it was a 10/10 for me!