A common trend across evaluations of WordNets extracted from lexical resources is that while the synsets themselves are reasonably precise, recall is often very low -that is, although extracted synsets are accurate when compared to reference WordNets such as PWN, not enough synsets are actually being extracted using automatic methods.
these results do not necessarily paint the full picture -there are few agreed principles or common guidelines for evaluating extracted synsets, and it is often difficult to decide what constitutes a correctly or incorrectly extracted synset.