Maybe you had fail people in your group or people with low ilvl?

The people I was in all had 400 ilvl and I found the mobs just melted, of course it took a bit longer then the last SB dungeons but it was still relatively fast.

Of course I tried to take multiple packs of mobs whenever it allowed for.
Fight or Flight with Total Eclipse - Prominence combo deals quite some damage on trash packs. And the fact of no TP so I can spam it for ages.

Bosses were quite cool and not too much 'bullet sponge'.