I don't think it's a bad thing to be hard on tropes that show you really haven't tried to do the research on any cultures you want to use. For Vikings, it's kind of sad that one of the better depictions of them was from the cartoon Gargoyles (not saying it wasn't a great cartoon though). You still tend to see horned helmets and depictions of Thor that are closer to Marvel's Thor. It's also kind of embarrassing to show up to a game where you're prepared to burn a rival's hall and slaughter the people as they run out and someone else wants to challenge them to honorable combat during the day. So awkward...GURPS Vikings is also good, in spite of its sometimes dismissive attitude toward the types of Hollywood tropes that many people (myself included) associate with viking/Norse roleplaying adventures.