Double daggers normal rotation should be lightning 4 > 5, earth 3 > 2 > 4 > 5 > fire 4 > 5 > 3 > 2. Lightning enables you to close in fast and toss them in a reasonable semicircle, then you death grip into the middle, AoE KD into bleed bomb with earth, AoE ignite with fire, blow up with high damage on those burning and finish off with more burning.
Just don't try it above lvl50 in story instances or dungeons, you'll be raped unless instance has a lot of NPCs to offtank for you. Works fine in open world stuff though, provided you keep them upgraded.
Has anyone actually managed to get sceptre/focus to work outside PvP bursting?