| Great post. Personally, I think that if anything is broken with Prot warriors, its that its generally regarded as difficult to level with them. Conversely, prot and feral are regarded as good/viable specs for leveling a paladin or a druid. I leveled as a prot warrior, and I think I am a better tank because of it.
In fact, you could argue that that is one of the major flaws of the game as a whole. Practice in a party environment is necessary to know what to do. The reason we don't learn all our skills at level 1 is it takes time to master any class, and every skill all at once can be overwhelming. We build an understanding as we level up. Playing as a prot warrior is not the same as playing as an arms/fury warrior. Trying to learn to tank starting at level 70 is like starting over with a new skill set. Now I know this might not be 100% true. Some people are faster learners than others, and an arms warrior who does tank while leveling should have most of the basics down. One thing that always suprises me when talking to other people in the game is how few instances they have done. I repeatability hear in a heroic group I am in that they have never even seen the instance before. Perhaps leveling as prot forced me to instance to level, but honestly, I had way more fun doing it that way than solo grinding (I was lucky enough to have friends to group with). | 
