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.
This is the first raiding I have done since a 14 month break, I had geared myself up for LFR to be awful, as in constant wipes and in fighting but all that happened was a big zerg on every fight, the only reason I have wiped in it was really poor dps which were then voted out and new dps came in and we killed everything.
I have my first proper raid tonight with my guild so it will be interesting to see how much different it is to the zergfest that is LFR, the first 4 bosses even on heroic modes don't look too difficult, I think the hardest bit is the spine of deathwing and having the DPS to nuke down ultraxion on heroic. However as soon as the 10% 15% buffs etc are introduced I would imagine a lot more guilds will pass these bosses.
Killing the final boss in a zerg like fashion was just lame though, I raided for about 3 months in ICC and I killed everything up to Lich King, I still haven't killed him but I feel I got a much better experience in ICC working towards that than just zerging deathwing in LFR.
I actually thought ICC had it nailed, casual players and randoms could easily take out the first 4 bosses, then later the next 3 once the nerfs kicked in. I don't think it was necessary for LFR to have you kill the end boss of the expansion, maybe the first 4-6 but you should have something that you need to work towards. I am sure there are lots of players that will kill DW in LFR and think thats them completed the game and stop playing.
It is weird, I would be happy if LFR was just normal mode, I would rather wipe a few times while people picked up the actual tactics than just zerg everything in the instance.