The classes I have taken have been interesting and challenging. It's a good idea to do some research on the professor, but generally you can expect a good experience. Class size really varies. I've had classes with 12 students, but also classes with 100+. Typically this doesn't affect the quality of the course, or at least it hasn't in my experience.
To find more tips for prospective students, what to do for fun and whether this school is great for a particular type of student read the 43 reviews for Washington University in St Louis
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My liberal arts education at Washington University has taught me that higher education does not lead to one endpoint, but rather to infinite opportunities to learn from and contribute value to society. The professors at Wash. U. dedicate their lives not only to research in their respective fields, but also to inspiring the same love of learning and passionate curiosity in their students. The overall atmosphere of intellect and support at Washington University is unparalleled by that of any other similar institution.» Read More
WashU is academically rigorous and has a very worthwhile education program. The teachers are phenomenal, and actually care about their students. The people are fun, friendly, and value high education without being pretentious or snobby.» Read More
Wash U is a great college to come to if you enjoy diversity. I really love that I can find my identity and learn about different cultures in the world. BUT... watch out for losing yourself; the college is rough the first year.» Read More