I know that the first three Caliphs are demonized in Shia Islam, and many Umayyad Caliphs are hated too (e.g. Yazid). I can't imagine they have the best outlook on the Abbasids either. How do Shi'ites then interpret the many military and cultural achievements attributed to these Caliphates?
/r/shia is the main Shia muslim sub on reddit. You can ask this question there and this has been asked several times there