You're going to meet some old friends from all four games here, Andrea, as well as many new characters. *smile* QfG5 does get a few things wrong in my not-so-humble-opinion, but most of the time it's right on target.
The setting is indeed similar to Greek mythology, with also other references to real-life stuff.
I remember well the excitement of getting my copy of QfG5 the day after it came out here in Australia, nearly ten years ago. Hmmm - hey, that's right. The QfG5 release date was 10th of December, 1998 - that means the game itself is nearly 10 years old. *starts darning a banner that says "Happy 10th Birthday, Quest for Glory 5"*
What, mad? No, not I... *innocently polishes his halo*