I've worked with a lot of structured programmers, and as much as they dislike working with my OO code, they never seem to have a problem using DBI.

On the other hand I see plenty of DBI-related questions on perlmonks and other perl-related discussion media. Lots of people seem to have problems with DBI (as with any other frequently used module)

Though to be fair, many of the posters apparently haven't read the documentation, or don't understand English well enough to grok the documentation.