The quality of the applicant's educational institution is taken into account by USCIS/DoL. The applicant provides a statement from a US education assessor as to the quality and scope of their non-US degrees.

For example someone with a 4 year Computer Science degree from a disreputable foreign university might only be able to claim equivalence with a US Associate Bachelors in Information Systems degree rather than a 4 year US CS degree.

While it's always fraught to compare educational institutions from across the world, the United States at least acknowledges that it isn't a trivial problem when assessing visa applications.