Not sure what to tell you, it was even stated in live letter prior to expansion release that open world monsters would provide a bit more of a challenge and that you would have to adjust your pulls accordingly or seek aid from other players near you. I personally know plenty of BRDs, MCHs, and Healers that have had 0 issues making their way through there and completing their quests at the appropriate level.

If the way you're approaching it isn't working for you perhaps an alternative would work better? I for one welcome the new world design and feel it has a much better balance than it did in the 2.x series.