* Individual student's interests and learning style: A student passionate about a subject will find classes in that area engaging, while a student whose learning style isn't catered to by the teaching methods might find the same classes tedious.
* Specific school and its resources: Well-funded schools with diverse extracurricular activities and engaging teachers often provide a more stimulating environment than underfunded schools with limited resources and overworked teachers.
* Curriculum and teaching methods: A rigid, rote-learning curriculum can be incredibly boring, while a project-based, inquiry-driven approach can be much more engaging. The quality of teaching – a teacher's ability to connect with students and make learning relevant – plays a huge role.
* Student's social life and overall well-being: Students facing social difficulties, bullying, or personal problems may find school overall a less enjoyable experience, regardless of the curriculum.
In short, there's no single answer. Some US students find school incredibly stimulating and rewarding, while others find it monotonous and frustrating. The experience is vastly different depending on the individual and their circumstances.