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1. IDK. in any case, a Jewish king is a constitutional monarch not an absolute monarch. He has checks and balances: the Sanhedrin, the nevi’im and the Bet haMikdash aristocracy. according to Radak (interestingly against Abarbanel) not only does one ignore a royal command contrary to a mitzva but the people have an obligation to rebel against a despotic king. In fact, according to the Yerushalmi (Horiot 3:2) the David was removed from office by the people.
2. Who says that they are considered low ranking presidents because of that? For that matter, who says that they are considered low ranking presidents?