Out of curiosity, what ORM do you particularly like?
My ORM experience is mostly Hibernate and some Django, and I think that they are both too advanced -- I ended up with a deeper understanding of Hibernate than I would care to admit, but it is really a minefield for developers.
It seems to me that the sweet spot is between Gorp and Hibernate -- the ORM should be able to load collection-valued properties on my struct, but it doesn't need to have programmatic query builders, a session cache, etc. I would prefer to write plain SQL, and treat the ORM as a way to map the result set into Go (with sugar for common cases like FindById and FindAll).
[1] Gorp, Jet, QBS
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On the topic of tight integration with ORM -- I was hoping to understand what kind of integration you had in mind?
For example, I used my own ORM on top of Play 1.x, and it didn't feel any different than using Django ORM, after adding a Play Plugin that started / committed / rolled back transactions for me.
Is that the extent of integration that you meant?
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I'll reply to the "Why not vanilla Go" question in a separate comment, since it is raised a number of times.