Some Advice?~

[Kallale]

Your party was wrong. They asked you to do something you were not geared to do. People have their cute "geared" strategies and forget that newer 50's are simply unable to execute them. The other DPS could have just helped you kill the adds, and the tank can pick up the adds as well. In short, you are going to be a fine DPS because you are looking to improve. The group you were with, not so much. They couldn't see the forest for the trees. Not all strategies will work for all situations. Make sure you are executing the proper rotations to the best of your ability and the DPS will happen as you upgrade gear and master the class.

P.S. Mrhappy1227 and SheepheadCG have good dungeon tutorials on youtube. Generally they are very thorough.