Do you think there is much to be learned from Greek Mythology?

As some of you know I am a deist. Due to this, I tend to not believe in many aspects of organized religions and their holy books.

However, I believe there is some level of truth to all belief systems, even if it is only on a small scale.

So do you think there is much to be learned from studying or researching Greek mythology (or any of the other ancient mythologies)?