Why do the complex characters in shakespeare's plays appeal to a wide audience?

The characters of William Shakespeare’s plays appeal to audiences because of their complexity.  This means that the character has many dimensions.  He is not entirely bad or good and there are explanations why his characters do the things that they do.  It is something the audience can relate to because just like the audience who watch his plays, his characters are just like everyday people who have their flaws and their virtues. Depending upon the situation even the minor characters shine when they perform on stage.