@seitann
No reason to bellyache. He's the protagonist, if he doesn't have something that makes him better than most other people what good is he to the story? Summoned to save the demon tribe, now in a position where he knows there's multiple tribes that needs saving. What was he going to do without his newfound OP memorization/visualization power? Draw shitty swords that don't really work a couple times a day? Oh boy, hella gettin' that save-the-world quest done.
Rely on the Queen to do everything? Then she's the protagonist, not him. Because she has the power and skill to get the job done and he doesn't. It doesn't necessarily have to be combat strength, but a protagonist has to have some sort of kit, some sort of toolset or ability paradigm that makes them capable of solving the story's issues. For some it's massive strength, incredible magic, raw goddamned charisma, or sheer freakin' plot armor. For this guy, he's using this world's natural, underappreciated abilities in conjunction with some kind of newfound schematic visualization thing going on in his head to vastly outstrip what they're prepared to handle.
That's already loads better than most isekai, since his 'strength' is entirely the strength of his new world just enhanced by an otherwise meaningless and useless ability.