I liked Mandos better when they were just cool guys in armor. Like Boba and Jango, but then Lucasfilm became aware of their fan favorite status and put them at the forefront of everything. Literally everything new we learn about them makes them look lamer and lamer. They went from asshole crusaders with a vague honorable backdrop to space samurai that have nothing but agreeable politics.
Less is more I feel.
Ultimately, their concept of honor is that of the ancient greeks, germanics and celts. A code they abide by, and if their opponent does not, by virtue of not knowing their code, then they deserve everything they get because they’re obviously dishonorable.
The idea that honor includes mercy towards outsiders is a newish addition to the concept.