[mattchew]

If you know SQL, they're often frustrating. You know what you want to do, but there's some ridiculous arcane approach to get those results via the ORM. If you can do it at all.

ORMs make it easy to do things like run queries inside a loop without realizing it. I worked on a site where the front page ran something like 200 queries every time it was accessed thanks to ORM magic.