I read Jeff's article and the comments here with interest. My only experience with an ORM is Doctrine2 (about 2.5 years) , and I've never really hit any issues.

I read Jeff's article and the comments here with interest. My only experience with an ORM is Doctrine2 (about 2.5 years) , and I've never really hit any issues. Whenever I've needed to duck out using the ORM in an edge case, its only been a few lines of code and very undisruptive. In a recent project I manually mapped a large sprawling ancient schema manually using Doctrine2, and still never hit any major blockers. The code just abstracts away over the cracks. Does anyone have any real world example articles on where an ORM has totally failed, and why?