Love it. Used Santa Teresa for the rum and Ramazzotti for amaro. Just what I had on hand. And that's saying something because I'm not a huge Campari fan. For my girlfriend I call this drink "Love to hate or hate to love?" because she loves Campari and amari in general but despises mezcal more than any other alcohol.
Like many drinkers, I'm not terribly fond of heavily peated drinks, but "The Departed," I found to be within my level of tolerance for peated drinks. As a result, this drink more than tolerable, but actually enjoyable. The Campari was able to assert itself over the Mezcal, and the El Dorado 15 (which I used), provided some appreciable sweetness, and the orange zest gave a nice, contrasting flavor to the drink (in hindsight, I wish I had added more orange zest than I did).
Overall, I found this drink to have many flavors that worked together to provide the drinker with a memorable drink, which I rated at 4.0. In short, "The Departed" should have a long life, and give a lot of pleasure to those who enjoy a better than average drink.