What was weakness of greek god Hades?

Hades' Weaknesses: Passionate over Persephone, the daughter of Demeter, whom Zeus promised to Hades as his bride. (Unfortunately, Zeus apparently neglected to mention it to either Demeter or Persephone.) Impulsive, favoring sudden, decisive actions. Can also be deceptive.

( http://gogreece.about.com/cs/mythology/a/mythhades.htm )