The training is insufficient for the complex level of information you are expected to know (at least for the AT&T account.)
Everything is about numbers, stats and reading from a script. It doesn't matter how well you handle a call. I was in the middle of a call that went over 7 minutes, when a floor supervisor made me end the call after telling the customer I was going to call her back. Things like that are to make it seem like you are taking more calls and handling them in a shorter amount of time.
If you are overqualified, you will get bored and frustrated very easily, and they will look for ways to get rid of you (like changing your schedule without telling you) before the benefit period kicks in.