Monster Hunter is a completely different level of crossover. It's literally just "here's a monster, fight it". You aren't expected to get invested.

NieR drags us through a whole alliance raid and interquels and six weeks of coming back for busywork quests for... what, exactly? A rambling and underexplained plot where everyone either treats us like a lackey or just makes zero effort to explain anything to us. A story on this scope deserves to be an enjoyable experience, but there was very little in it that made me care about any of what was happening.