The level might be horrible on legendary but if you look around and stuff it might be the most beautiful and disgusting level bungie has done with Halo and i don't think 343 will top it in level design and art direction now don't call me a hater but just boot up halo 3 and the level cortana and just look around you can see so much going on.
Small note
no i don't hate 343 i just think they should take more time on the art side off it all.
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That mission was so cool, especially since you go through the Council Chamber and the Mausoleum of the Arbiters while it's all floodified You were originally supposed to fight the original Arbiters infected by flood but they cut that out of the game