Karazhan: The UBRS of Outland?

It's natural to take something new and apply something old to it to describe it.

Orange is the new pink.
Random is the new order.
Honor Hold is the new Barrens.

Well apparently after hearing/seeing this comment in several different places, Karazhan is the new UBRS. I'm not entirely sure what that means. I'm not sure if its a reflection of its size, raid requirement, complexity or lack thereof, or what.

Karazhan, lore depicted here, is the first 10-man raid instance which seems to be the lowest place you can getepic loot. (Aside from doing instances on heroic.) Here at WoW Insider they even question if its worth doing. I haven't looked into whether you need the rep from there (like you could get Argent Dawn rep from going to Scholomance and Stratholme in order to go to Naxxramas), or if it drops resist gear that is needed further up the raid chain (in the same way after running MC over and over you had fire resist that helped you with Ragnaros and further on to BWL) or if at the end if something drops that allows you access to another instance (the way the blood of Drakkisath was required to get into Onxyia's Lair.)

So although Karazhan is being described this way, its not really revealing anything to me that I can connect to.

At least not like how Magtheridon is the new Onyxia. I totally understand that.