Hearthpwn

well i say you have no knowledge of the game whatsoever.

regarding your question,warrior and priest(especially grinder priest) are great counters to aggro.

 Any deck that uses cheap taunts at the beginning and can then just aofe spells to empty the board.

Beating aggro is very easy.  The more difficult part is beating aggro with a deck that still has game against other decks.

Kezan Mystic Deathlord and Loatheb beats aggro and you can put those in any deck