All castles in Heroes 3.

That's why it's "Heroes of Might and Magic" and not "Peasants of the Sickle and Hammer" :). And heroes, in general, don't fit into human assessments. Undead are good, in my opinion.

Yeah, when they're lying where they're supposed to be (i.e., buried).
I'm not against undead for now, but psychologically and morally, "boneheads" are unsettling. Although gremlins and troglodytes aren't much better.