I have gone through the dungeons once, and here are my initial impressions. Some of the bosses seemed really easy, and the only wipes we had were because of really stupid mistakes (not clearing trash, healer {aka me} standing in shit way, way too long). Even then it was only two wipes between the three dungeons.
I thought the challenge level was much lower than what the troll heroics were when they were first released. Especially the trash, both in relative difficulty and the amount. We regularly had a hunter freeze a mob before a pull, and if there was something that needed killing asap it was marked. However it honestly seemed like we could of progressed even if we had not done so. This was with a party of around ilevel 368 on average so if your tank is geared less plan accordingly.
While the first two dungeons have a certain flair and epicness to them (for a five man), I wasn't very impressed with the design of the third part. Basically you are just huffing it through Dragonblight, killing a couple of (weak) bosses along the way until you get to Wyrmrest Temple. The final boss was a challenging fight without being too crazy.
I liked how they had a few quests per dungeon, with most of them giving you a choice of ilevel 378 loot.
I would give all three of them, rated together, 4 out of 5.
On a side note, I noticed that chaos orbs are now tradeable . . after I completed the third dungeon lol.
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I need a new hobby . .
Ten level 85's (one of each class) in WoW
Back to try out the Feb patch in AC