...but it's the worst up-front experience I've ever had with a below-extreme content in this game. I have come to really appreciate and enjoy the mechanics of the raid - but I probably died 10 times on that first run. And this is because it's perhaps the worst content SE has ever added to the game when it comes to teaching mechanics.
As someone who mostly does PUGed raids, I'm pretty accustomed to bosses following a fairly strict, 2-step routine:
1) demonstrate abilities,
2) complicate/stack/increase haste of said abilities.
DR doesn't do that well at all. Some of the abilities during some of the fights are sort of telegraphed. But a lot of these mechanics - probably even most - are just something you have to pick up on. A good example of this is the fire/ice arrow "maze" on the fifth encounter. Just looking at it the first time, I had absolutely no idea what was going on (I'd read a strat before entering, but wasn't clear on exactly what I was supposed to be doing). Now, is it fun once you learn it? Absolutely. But the 'first contact' experience feels... I dunno... dirty to me; unclean; messy; or, to quote the Griffin: SLOPPAY.
Look, I know nobody wants to rehash what's the better part of year-old content at this juncture, and I think that DR is really, really an excellent experience once you have it on lock. But... I don't know that it's really suitable for casual play. The initial takeaway is that it feels somewhere between savage and EX (no, it's not that hard once you learn it, but the learning curve makes it feel like that the initial few times). And, honestly, after running into that buzzsaw the first time, I just didn't want to do it again. It made me feel inept. And I don't think that's an emotion that a lot of casual FFXIV players are accustomed to experiencing when it comes to PUGed content. If I had to hazard a guess, I'd wager that a lot of them tried it once and never went back. I almost did - I'm not ashamed to admit it; I was embarrassed and didn't want to try again.
I guess what I'm trying to say is, DR turned out to be fun, but considering it within the context of the rest of the content of the game for the majority of the casual crowd, it's nightmarish to begin with. And first impressions are such a big deal - especially when the majority of us have been waged on a strict diet of pretty soft encounters. This isn't a plea for SE to nerf the raid or something like that... just maybe keep in mind moving forward that this isn't what people are used to seeing in your product.