Should I avoid a university because its entrance difficulty seems too low for me?

You do not need to exclude it automatically. Entrance difficulty mainly reflects the applicant pool and selection conditions in a given year; it does not directly measure educational content or your personal fit. Check whether the depth and pace of study, learning environment, and possible pathways match your goals. Rather than deciding solely because it seems easy, compare a balanced set of challenge, realistic, and safer options, along with commuting and costs. Confirm faculty- and program-specific details in official materials.