Sure, you can deal damage with every spec in the game, but Protection will never compare to Retribution in amount of damage done per second. The majority of Protection's DPS comes from stacking Vengeance, which requires being hit in the face by something hard and heavy.
I found the solution to be to just tank instead. You get to deal damage as Protection and you get faster queues.
Note: For leveling, Protection will likely be almost as powerful as Retribution, if not more powerful earlier on, due to you getting hit all the time. In dungeons, you should not be taking damage as a damage dealer and therefore won't stack Vengeance.
Edited, Oct 1st 2012 11:54pm by Mazra
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Please "talk up" if your comprehension white-shifts. I will use simple-happy language-words to help you understand.