Erasmus offers plenty opportunities to interact with many different people from different cultures and also many options of clubs and organisations for personal and social development. Study-wise, having studied IBEB in the Erasmus School of Economics, the following can only apply to this faculty, since others may slightly differ:
The university provides plenty challenges and a lot of study material, which is usually quite overwhelming. It would however not necessarily be a bad thing, if not in combination with very difficult exams whose sole purpose (Not always but usually) is to fail as many students as possible, rather than testing the knowledge and understanding of the subject. Most written assignments are also very subjectively graded and nothing can be done about an unfairly low grade, as any attempts to complain will only “annoy correctors” and yeald an even lower grade. Although a lot of professors are very good at their job and do their best to spread their knowledge and make sure students understand the subject, some also just seem to take teaching as an unpleasant chore and ignore any “unimportant” tasks, such as correcting mistakes they may have made in exams, or answering concerns…
The university also hires teaching assistants, who in turn teach tutorials for selected courses. Often times they are the main source of information for students, although some may need to be more carefully selected (in my opinion, PhD students do not belong in tutorials. “We pay them so we should use them” should not be an argument…)
Overall, at Erasmus, you learn a lot of information, but you have to be ready to study a lot by yourself and with friends if you want to succeed. Slacking even a few days means you are left behind and it is very hard to catch up again. But once you make it through, you will have enough information to go out in the world.