Credit Cards for Average Credit
First of all, let's clarify what average credit is. Sometimes you may read or hear people talking about fair credit, that's another "name" for average credit. If you look at the range of credit scores, the numbers between 640 and 699 will indicate average credit. Those are from FICO score range, other systems and banks may have their own credit rating scores, but in general they are pretty much the same.
When you have average credit, that means that you do not have bad things on your credit reports, well... at least significant bad items. You manage your credit card accounts responsibly, keep your balances low, and rarely pay late. This behavior has helped you to build average credit and given you more credit card opportunities. You have more credit card options to choose from.
However, even though there are a lot of offers, average credit card interest rates may not be as low as you wish. It is possible to find offers with a 0% intro APR though. But banks do not give such opportunities often.
Another good thing when you have average credit is a credit limit. A credit card for average credit with high credit limit is not only a promise any more. Your well managed credit can get you decent line of credit. Moreover, banks offer credit increase opportunities to those who treat their credit accounts well.