Although strong and resourceful in the face of adversity, ultimately, mams are always victims. Slags', on the other hand, are female victims who do not cope. Their appearance and home are usually disordered. The slag can be self-aware, but this often manifests itself in moving speeches, because in terms of action she is impotent. They are permitted to be verbally expressive about their feelings, but this tends to imprison them within the domestic setting.
Slags are, of course, the best parts to play.
Osborne's play, in particular, is arguably one of the greatest Welsh plays of the Twentieth Century. I would especially argue against a naff, self-conscious and counterfeit 'feminist' approach. Nevertheless, playwrights may wish to consider that the way in which women are portrayed is a residue of imperialism and finding more authoritative descriptions of female characters is a necessary part of the process of decolonising the Welsh mindset. In local reality, working-class women from the Valleys are frequently articulate, powerful, determining and effectual and the impression that it is an exclusively patriarchal society is not wholly supportable in practice. However, this is not generally the picture disclosed by playwrights, who tend to under-write their descriptions of women from the Valleys.