Naberrie, I have only had experiences from your first group. I run low level roulette every day (either for the experience or the tomes, depending on which class I feel like playing). I've never gotten anything higher than Halatali/Ifrit (don't remember which of those is higher, I just know they're both around lvl 20). I get Sastasha most frequently, then Halatali. Sometimes Copperbell or Tam-Tara. If I'm lucky, I get Ifrit.

I would really like to see higher level dungeons, if only for the sake of variety. While leveling my WHM, I realized that I hadn't even tried harder content, so I went into story mode Garuda to see what it was like. But I've never gotten Garuda through Duty Roulette.