IMHO there are two requirements for a good password:

1. It must be hard for a computer to guess.

2. It must be easy for a human to remember. If you can not set a secure password and then remember it a week later it is a bad password.

This is why I really hate overly strict password requirements that make it hard to remember. These cause people to write it down or do things that appease the password checker but don't make it harder to guess.