i have adjusted my playstyle a bit to compensate. what i used to do was use something, usually shield lob to get initial threat, then flash x2, then start working on strikes to get threat built on each target. cycling in a flash here and there to maintain.
my new adjusted pull style which almost always works now is to still pull with shield lob, and then i immediately Flash the number of mobs +1. so if there are three in the pull, i flash 4 times. this seems to get me enough threat out of the gate to keep aggro during the initial AOE-fest, i follow with CoS, and then I start working on rotation. i will then usually Flash x2 after every rotation or so to make sure to keep threat. this really only needs to be done when the group goes AOE crazy.
another thing i did was picked up Fracture from the Marauder skills. While not always useful, i sometimes will throw it up on nonfocused mobs to give me just an extra little bit of threat generation on the mobs i am not currently focusing on.