While many might say that Ulduar was a difficult, frustrating raid (that as then rendered useless by TotC), one thing is certain about it. Ulduar inspired people. The number of music tracks, videos, and movies inspired by Ulduar blows away any memory of Naxxramas.
Realityshock created Ulduar: In The Mountains as a tribute to the immense amount of work and effort that went into creating the raid.The video is also dedicated to those brave raiders who spent hours pushing their way through the instance, working to see all the art that Blizzard had created for us.
I still enjoy these raid summary videos, since they help convey a sense of what new folks might have missed. Nice job, Realityshock.