So you agree, or you disagree? Sorry to stick with Aristotelian logic.
The difference, in case you're curious, is willful pedantry, and really just clutters up the thread.
MTGox is not a legally regulated bank. They are not a legally regulated exchange. They DO hold accounts on behalf of their customers, performing the function known as "banking". They DO execute trades between their customers, performing the function known as "an exchange".
Since it's obvious we do need banks for bitcoin (or a safe way to store our currency) and it's not very anonymous, what's the point of using it again?
I would rather just use credit cards or cash.
The decentralization has more to do with the fact that no government can control the currency.