...one idea here - before the DLC i was really a weapon-scrub, didn't have solid arsenal so Elemental modifiers were the Hardest Nightfall part for me. what i ended up doing was i would have kept at least on Rare [blue] weapon of each elemental-type in my Special/Heavy slots (maxed out, it really doesnt cost too much) so that i have that extra edge in NFs now, i might b completely mistaken here, in which case i'd like to ask the more informed ones to correct me, but from what i read on several game forums, the Elemental Burn modifier in Destiny is 300%. so if that really is so, and Blue weapon with relevant Elemental damage will easily outclass ANY Exotic that doesn't have it (again, only in Nightfall) ...if you want, test it and let us know the results