Possible Attitudes that Slakenburgians have to the Primarchs.

Lion El' Jonson: Feared, widely thought of a crazed dogmatist for the Imperium.
Fulgrim: Despite being the Primarch of one the divine powers, everybody thinks he is too cringe. Even the handmaidens disavow.
Perturabo: Widely the most popular primarch on Slakenburg. Most believed that he carried the Heresy and abandoned the heresy when the Heresy fell to Nurgle. Adopted by the Borgs as their Primarch.
Jaghatai Khan: Adopted by the Handmaidens as their Primarch for freedom as a less cringe alternative to Fulgrim.
Leman Russ: Hated for the burning of Prospero which was thought of hastening the decline of the Imperium.
Rogal Dorn: Respected but less well thought of then Perturabo.
Konrad Curze: No firm consensus has been reached. Widely debated on whether he was justified for destroying Nostramo.
Sanguinius: Pitied for sacrificing his life for a decaying Imperium.
Ferrus Manus: Who?
Angron: Adopted by the USA as both a model and an object lesson.
Roboute Guilliman: The most feared Primarch by Slakenburgians. Known as the competent one.
Mortarion: Most hated Primarch for surrendering to Nurgle.
Magnus the Red: Not super popular but respected. Adopted by the Admistration of Slakenburg.
Horus Lupercal: Thought of as a tragic figure. The Horus Heresy was widely thought of as the last chance for the Imperium to fix itself but was doomed from the start by trying to work with Nurgle.
Lorgar Aurelian: Widely known as the Fool for trying to unite Nurgle with the other powers.
Vulkan: Most widely respected and praised loyalist primarch for his care for the ordinary people of the Imperium.
Corvus Corax: Not widely known about.
Alpharius Omegon: As confused by them as Alpharius Omegon is confused by Slakenburg.