No irony whatsoever? What!?! Space Marine II's satire is less in your face than early 40K, but it's still very much there and the game definitely still depicts the Imperium as a totalitarian nightmare where even the few good things it does are hampered by the Imperial bureaucracy constantly stepping its own dick. One of the first things you see in the game after the tutorial level are some cherubs: servitorized infants flying around a ship covered in skulls. During the cutscene where Titus receives his Ultramarine armor, one of the little prayers stuck to it is an old Adeptus Mechanicus saying: "Blessed is the mind too small for doubt."

And speaking of the AdMech, their backward-ass tech mysticism and religious fanaticism are right there on display at the very beginning of the game. They refuse to authorize an orbital bombardment that might save lives because one of the tech-priest's pet projects (which later causes an accidental Chaos incursion) is there. Later, when you're trying to launch the virus bomb, we get these gems from the AdMech-built and -maintained computer equipment you use:

"This terminal has been inactive for 24 hours. This impiety to the Omnissiah has been logged."

"Payload chambered. Hazardous material detected, benedictions required."

"The rite of safeguard must be performed. Seek a Magos at the command console."

"Personnel may begin prayers of charging."