Let's get back to the grind then.

Translated as "Stupid Italy" Hetalia is the personification of World Nations, most notably Europe which mark out events in World History including America's Independence, the Holy Roman Empire and of course World War II with North Italy (yes Italy was split once) being the main character these events revolve around. It's done as a gag comedy that takes light hearted punts at Historical Events mostly for laughs but sometimes can be heart warming or even tearjerking depending on the event.
The dub went the extra mile and added accents which is as cringy as it sounds but the narrator wins purely on her sense of humour as well as the script itself being fun.
Each episode is barely five minutes long so it doesn't out stay it's welcome however some segments particularly cat-talia really scrapes the barrel for comedy, it also works against the series to have some notable nations missing as well as failing to really dig deeper beyond the Allies and Axis Powers. Also the movie was dreadful, proving that they lack the creative process to come up with original storylines relying on historical facts and country to country relations only.
Final Verdict: When done right Hetalia can really be insightful and fun but it's clear the writers are working from a very limited well of ideas when the best original storyline they can come up with is the same characters as cats.