Cryptopia is the best overall exchange out there, hands down.   Lots of folks have already listed all the features, but what i have not seen being mentioned is the following:

The wallets are always working and if they need to go into maintenance  its usually for a short time while the new version is synched.  Not like Yoshit crappiness

Not once have i seen Cryptopia down, its always there for you.

The owners/admins have a very insightful view about cryptocurrencys.  This is not just another bussiness for them, they truly believe in cryptocurrency and are actually working to make it safe, fun and useful for the current users and all who are willing to give it a go.

The trollbox is absolutely amazing.  Folks from literally all around the globe, coming together and comunicating in different languages, the vast majority of time helping the other users and having a blast.  

I heard about Cryptopia when i was entering the cryptobarren lands;  it was my first and still is my best        Since the beggining i always felt it as my home.  

I freaking luv Topia.