It should definitely go in the Main Story Roulette, or at least the first version of the Expert Roulette before the new dungeons come out, it drops no loot, but most people I see just dump it on the floor anyway and as for cut-scenes, they aren't very long, nor will it ruin anyone's day by waiting a whopping 2 minutes for someone to watch them.

I love the dungeon, but there is very little reason to run it once you beat it aside from the first 2 weeks when everyone was grinding Law.