if you can't beat an enrage timer that means you are under geared or healer needs to dps more.
cleared 7/7 HM with pugs...
gear progression is as follows
Belsavis and Ilum dailies > to gear up for Normal Ops and HM Flashpoints > HM Ops > NMM Ops
cleared all HM without barely any Columi, mostly Champion PvP gear