my views on the caliphs are thus
Caliph 1 made the mistakes of fadak and claiming the caliphate whn it shld have been Imam Ali but he did a good job none the less... he wasnt a bad person and May Allah reward him
Caliph 2 made changes 2 the religion such as intrdouction of congregatiuonal Taraweh and he tried 2 impose a max tariff on mahars.... again mistakes but he 2 did not do anything vindictively... ? over his involvement with the door incident ... I hope its not true
Caliph 3 was politically weak and never shld have been caliph... he also did nepotisim which led 2 his downfall