Hearthpwn

i dont exactly know the order, but in my case it is

Mage, rogue, shaman, paladin, warlock, druid, hunter, priest.  

My highest win is with shaman (10 wins) but that was because i had an amazing deck,  

Playstyle in arena is, 

1 play like a zoo type, a lot of 2 and 3 mana minions

2 play on curve, 2 drop, 3 drop etc 

Make also sure you use all your mana in the early turns. (you can skip turn 1 if you don't have a 1 mana minion) but play a 3 mana minion or 2 + 1 mana on turn 3

kill the opponent minions almost all the time but you can go face if you are ahead on board and his minions aren't scary