I don't think I've ever waited more than 10 minutes for story roulette, even queueing as a Dragoon.
@OP - plenty of people are going for Novus, which means Expert Roulette is a must. The myth tomes you get are really good too, especially if you hop into story roulette and have a newbie in the party. I'll take 230 myth for a 20-30 minute dungeon (40 if they watch the cut scenes, but that doesn't bug me). Hunting is intensely cut-throat on a lot of levels. I know that I personally get mentally fatigued by doing it long-term. Yes, the rewards are awesome but it's not really what I'd call fun a lot of the time. It's a flat-out non-stop grind.
Also consider that slow loaders never make it to mobs before they're dead; I built a gaming PC just a few months ago and I still don't make it half the time during prime time. PS3 players don't stand a chance.
Basically, dungeons are there to offer options. Options are good. Variety is good.