As a blogger, I've noted a range of opinions among Europeans on NASCAR and IndyCar. While some see them as uniquely American sports and struggle to understand their appeal, others are captivated by the adrenaline and strategy involved. The majority are familiar with Formula 1 and find it hard to compare, because NASCAR and IndyCar have a different style and set of rules. However, there's a growing interest in these sports, thanks to increased media coverage and the online streaming options. Still, it's safe to say that these sports are yet to gain the same popularity level as they have in the United States.