I ran Dark Sun once (owned some 2e material, but never used it). From memory, I think I ran it during the 5e playtest days or maybe with 3.5, I certainly recall using the 4e stuff as well as 2e and 3.x for inspiration.
I'm pretty much aligned with Eltab - when I ran it, no-one wanted to be a Defiler, it wasn't even a question. For me, I think of it as an option for NPC's, the bad guys; PC's should be assumed to be Preservers so it's not really an issue. Tempting players with the dark side feels very old-school to me, something AD&D certainly played around with in 1e and 2e probably from watching the 2nd and 3rd star wars movies, but I don't think it really worked out in real life play for D&D - if you tempt players with a better option if they become evil, well good luck running your evil back-stabbing game (unless that's specifically what everyone signed up for).