Dun Scaith - Like weeping City initially, it's pretty fun, cleared it in first hour but the mechanics are heavily reused from previous alliance raids, so it's a nice "be on your toes" type mechanics since they're VERY easy, but it gets very hectic when people aren't paying attention.
If you're tanking and didn't do Creator Savage, you SHOULD boost your ilvl...especially if you're PLD, surprisingly. The main wall, at least I noticed on Aether so far is Ferdiad because people either panick or don't understand Water Debuff = Turn Blue Circles red, Fire Debuff = Turn red/yellow circles blue.
Zurvan Ex - Since my FC already raided Creator Savage it wasn't too bad, but it's definitely harder than Sophia Ex, there's a couple of phases to it which are fairly straight forward but it's definitely mechanic driven more so than DPS check at end (similar to Sophia Ex.)
Won't comment on MSQ since I'm waiting till part 2 to actually do it fully, but the two new dungeons are fairly interesting mechanically as well, so expect to see rage quits for a few days lol.