Most home broadband router come with a WPA passphrase already preset. Using WPS based setup, some user may never see this key and other may rely on its randomness (which may be better than user generated keys if done well).
Please help us to make overview of the default passphrase strength for different brands of home router. Please add your router also if it comes with a good key.
The resulting list of this passphrase properties will be published and regularly updated on our site:
https://www.agrs.tu-berlin.de/wpa