Anyone else having difficulty while playing on Destiny's PvP, the Crucible?

I am decently good but by no means great at Titanfall and Battlefield 4 (about a 2-to-1 Kill to Death ratio), but the Crucible in Destiny is crushing. I am new to xbox, have never played any similar games such as Halo, and I am thinking that it has to do with players being able to take more damage due to their shields. There must be combinations suited to various styles of play.

By the way, I am currently playing as a Hunter in Destiny. Any suggestions? If I get another 1-to-4 kill to death ratio I may toss my controller through the window.