Not that anon but it's a story driven game. Serious Sam uses the story as a launching pad to get the player from one combat arena to another to be engaged in the combat loop. Hence why it's over the top, goofy, and not to be taken serious. It's a giant cheesy 80's action movie and that's where the context of the combat loop comes from even though it's not really needed.
Wolfenstein TNO/TNC treat the story as important as the combat arenas/loop. In TNO it was a surprisingly good and poignant story in a world that, while easily could be done wrong and come off as over the top and silly betraying the tone, felt fleshed out and grounded. Character interactions and arcs felt meaningful and provided weight to the story beats. But then TNC comes along and all of that goes out the window. It was almost like a shitty fan effort of TNO without understanding why TNO was such a well received game. Was the combat loop/arena improved? Sorta, they took a lot of steps back with weapon variety and didn't really capitalize on the added movement mechanics. A lot of the story beats just felt like copies of TNO but shittier (go to the moon in TNO, GO TO FUCKING VENUS IN TNC!). Plus story wise there's a lot of moments where you have these two new characters who don't seem to interact with the other characters as much as they just soapbox to you, the player, while the player inserts just sit around and twiddle their thumbs up their asses. It's ultimately jarring.
Also it ends on this shit.https://www.youtube.com/watch?v=tRQ4fyw5zzM