ETL is just a small part of it, and engineers should probably have more of a role than they do. My last project was a data warehouse one, where the thing was obviously slapped together by PowerCenter users. They thought it was all about the ETL, They forgot the other 95%, how to engineer large scale, complex, maintainable software solutions.

Sure, let the powecenter users "write the ETL", but then they need to get the heck out of the way and let the big boys actually build the warehouse.