Hammer build
Well the Hammer really isn’t a PvE weapon, but there are plenty of builds and guides for WvW. There’s usually one one the front page.
Hammer is horrible in PvE – very low dps and the control it provides is not that useful in most cases and actually useless with bosses who have Defiance. It is, however, great for PvP and WvW. This seems a nice build for WvW, hammer+sword/warhorn: http://de.gw2skills.net/editor/?fJAQNBiYDbkpjyQr8wzD6QDwFUI77AQZK83pbgQYDA-TFDEABJ8AAsTzQUKRG+IAslSQmUeJxFAQR1faTHBAHIgHOIAxs/ApAYSZE-w
