It would actually be ok if it didn't affect other difficulties, but I am afraid part of why Deathwing was so boring is because more interesting/dangerous mechanics in normal/heroic fight wouldn't be suitable for LFR.
Take Lich king for example, even if they dumb it down it still would be impossible in your average LFR group, but that would make the fight a very boring "Patchwerk".
So, I think that at least in the current tier, the LFR is actually hurting the quality of other raid difficulties. Maybe in Pandaland Blizz will figure out a way to make it less of an issue, but somehow I don't believe it.
Many who raid heroics hoped that the introduction of LFR would allow blizz to tune normal and heroic modes higher, but instead it turned out that it wasn't the case. Normals are even easier than pre-nerf T12 and heroic Ragnaros eats Deathwing for breakfast difficulty-wise.