User blog comment:HinaAsobi/Should I Bring Hetalia season 1 in Class?/@comment-2241574-20101002185342

As helpful as it may seem, you have to remember that the historical events shown in Hetalia are only the basics. They don't cover the (essential) details that are integral to fully understanding past events. I will admit that Hetalia does a good job piquing interest but, to actually learn, one has to do outside research for deeper understanding.

Also, keep in mind that people with History majors and people who are enthusiasts can see Hetalia as a mockery of the events that actually happened, as Hetalia tends to gloss over the darker moments in history (except for certain episodes, e.g. the American Revolution)

I will say this: Hetalia would probably be okay for HS history classes (unless it's an AP/IV course). But with today's culture, I doubt anthropomorphic countries drawn by Japanese artists will have a significant effect on the students (if they don't initially enjoy manga/anime)