You can just look at some online tiers instead of taking my word for it:
http://metastats.net/
1 Pirate Warrior Deck
2 Token/Aggro Druid Deck
3 Elemental Shaman Deck
4 Control Warrior Deck
5 Quest Rogue Deck
6 Elemental Paladin Deck
7 Zoo Warlock Deck
http://metastats.net/decksbyrank/
Rank 5 to Legend
Aggro Murloc Shaman
Midrange Hunter
Pirate Warrior
Quest Rogue
Handlock
Tiers are changing daily though so this is not anything to take into consideration.
If you want my personal tier list, then it's something like this:
Tier 1:
Pirate Warrior (only deck that for me actually belongs in tier 1, the rest are still up in the air)
Tier 2:
Aggro Murloc Shaman
Elemental Jade Shaman
Handlock (this deck is really solid and beats a lot of stuff in the meta)
Control Warrior
Quest Rogue
Discard Zoo (non Quest)
Midrange/Hybrid Hunter
Elemental Midrange Paladin
Miracoli Plant Rogue
Expect some of these tier 2 to move down and some to move up.
Tier 3
Elemental Dragon Priest
Elemental Tempo Mage
Exodia Mage
Token Aggro Druid
Jade Druid
Freeze Mage
Quest Deathrattle Priest
Combo Control Priest