From my experience, Europeans have mixed feelings about NASCAR and IndyCar. Some view these sports as exciting, high-adrenaline competitions that showcase driver skill and mechanical engineering prowess. Others, however, see them as less sophisticated than Formula 1, which is more popular in Europe. There's also a perception that the oval circuits common in NASCAR and IndyCar lack the complexity and variety of Formula 1 tracks. Overall, there's respect for the sports, but they're often overshadowed by Europe's love for Formula 1.