Right now the lvl 90 roulette is just the dungeons available at launch. Of those, the only one everyone plays is Dead Ends. You would think everyone would unlock Smileton and Dreamscape, but a lot never do. Next patch when Alzadals Legacy joins the rotation, youll have 2 that everyone needs to run so the Dead Ends sightings will slow down a little. As for expert, i get AL more often then Troia personally. Just a quirk of the matchmaking and RNG.