^^ This.

It seems Blizzard really got lazy this expansion.
So, they took out attunements, is that an excuse to have 0 quests for Naxx, aside from the Saphiron heart thing?
And Ulduar just don't feel the same when the only quest comes from the healer weapon legendary chain inside.
I don't think attunements should have been removed.
I think they should've been simplified, to the point of "Do a solo'able quest chain, kill the last boss of 2-3 heroics for another chain, and do a summon-able, 10-mannable world boss."
I think that would make a fun atunement chain for naxx, and do a smaller one for OS, and let the heart be the one for Maly.
Do the same thing with ToC, UIduar and ICC and I would've been happy.

To stay on topic.
If all the bosses in a raid have to share weapon models, fine.
But just give the end boss unique looking loot.

The 2hander won't make people stop and think "Wow, that guys taken down the LK..."
It'll make people think "Hey, well atleast I know that guys competent enough to do 'Lord Marrogar must die!".