Pirate warrior is a hyper agressive deck, utilizing it's low mana curve to establish early board dominance and snowball that to a victory, finishing the game with weapons and direct face damage.
Pirate warrior lost some of it's popularity with the introduction of Token Shaman and Aggro Druid, more decks playing taunts, and Golakka Crawler. Dispite all that, it is still a very strong and viable deck to climb the ladder fast.
Feel free to take out 2x Mortal Strike and put in either 2 Hungry Crabs or 2 Golakka Crawlers.
Replacing 1 Mortal Strike with Captain Greenskin can get you the needed long term damage.
To use this deck, copy it to your clipboard and create a new deck in Hearthstone