The biggest disadvantage of playing casino on credit or at casinos with card payment for that matter, that it takes a while before the money is in the bank account if you transfer to you bank card.
Casinos have previously been quite tough with the fact that you have to withdraw the money in the same way as you have deposited it.
Although they have generally become less restrictive about this, it is something you should consider before you pull up your credit card to deposit money at a casino.
You cannot withdraw the money to your credit card (bank cards are fine) because there is no account for the credit.
Thus, you have to withdraw the money to your bank account, which is usually not a problem if the account is your own.
With larger withdrawals, however, this can be a bit complicated, and from my own experience I had to deal with the customer support at a casino for over a month before I got my money out.
However, it should be said that it has happened once out of probably ten times I have withdrawn money, but after all worth noting.