In my opinion Elixir Ecto is ORM done right:

1. the functional/immutable nature of Elixir makes read and writes much more explicit and there is no need to magically track deep mutations of nested objects to translate them back into UPDATE/INSERT queries

2. Elixirs support for lisp-like macros allows for an ergonomic embedded query languages that is syntax and schema checked, mirrors raw SQL really well and, frees you from string-oriented query building

3. the query builder DSL addresses one of the main weaknesses of SQL query statements not being composable

4. The automatic conversion between JOINed tables (on the DB side) and nested structs (on the Elixir side) is done on the right abstraction level to work reliable and and being explicit enough to generate predictable queries.