If the ADCtH from Ghoulish Hunger applies to all skills used while it’s active, then that makes it a potentially appealing choice for a circuit breaker for caster builds (ie: for AAR). If the ADCtH only occurs for weapon damage, then its utility for a caster build is quite a bit lower.
My search-fu failed to come up with a conclusive answer, but the general gist of replies seems to be that Ghoulish Hunger applies to everything.
Any insight provided would be helpful and most appreciated.