I still do them on my non-main jobs to level up. They are great for one reason: you don't need to worry about gear. They lock you to the 50/60 level where Ironworks and Shire gear takes care of all the gearing needs.

In fact, my RDM got from 50 to 70 mostly through these roulettes while questing (and my WHM took the quest EXP). Whem my RDM dinged 70, I was still finishing off the level 60 Heavensward quests. So my RDM had only ever worn Ironworks, then Shire gear, then the level 70 job gear and now finally Verity gear.

Note that I only did them once a day, to always have the daily bonus. I wouldn't bother doing them without the boosted EXP gain that came with the once-a-day roulette bonus.