If you come across a mob in your level range have a go, but if they pull a stunt on you that makes them bad news, dont stick about killing more, go and find something else.
Satyrs and Ghouls and Skeletons will take you to 55-56 pretty easily. At this point you should consider some of the end grind spots. Winterspring is a very popular one and contains a lot of kill quests.
Youll need to complete a furbolg kill quest to sell World Of Warcraft Gold to pass through the tunel at the northern end of felwood to get into WS but its not too taxing.
If youre a warrior as I was, you can just say bollocks to them and run through with shield wall up toward the end. Might take you one death but its a lot quicker than working your faction.