The custom feature report lists all of the features and if they are valid or not. However; it does not list which part the features belong to when an entire assembly is checked. This makes it almost impossible to fix issues since many of the assemblies I have have hundreds of parts.
If the report listed the part the feature belonged to, this would simplify fixing the issues.
As can be seen below, the part the issues is associated with is not shown. This assembly has close to 300 parts.