There was a lot of chatter in the community last week that normal-mode Dragon Soul is too easy.
I disagree. After experiencing the first six fights (on 25-man), I think that Blizzard has done a solid job and the majority of the fights are correctly tuned for normal mode.
The thing about T11 and T12 is that the difficulty curve was very flat. There was not a lot of difference in difficulty between the non-end bosses. If you can beat Shannox, you can beat any non-Ragnaros boss. I've talked about this before, but I think that was a mistake. An instance works better when there is a clear ramp up in difficulty.
Morchok is pretty easy, true. But he's the first boss. Yor'sahj and Zonnzoznzonznnnz (or whatever his name is) are a solid step up. Hargara is another step up from those two. Then Ultraxion is large step up from Hargara (possibly a touch overtuned). Warmaster Blackthorn is about the same level, but is a coordination fight instead of pure performance.
There is a very clear slope of difficulty in Dragon Soul. Almost every guild should be able to get Morchok down. Then they can at least farm him and Raid Finder until they can beat the next two. And so on.
Normal mode Dragon Soul features a real progression in fight difficulty, unlike all the other tiers this expansion. Blizzard has done a good job with tuning this instance, at least in 25s.