I watched the first episode last night, and though it was interesting in some respects (my knowledge of the Ottoman empire is limited to Venetian intrigues, the gates of Vienna, and the Battle of Lepanto) for me it was the type of costume drama where they've spent all the money on the costumes, and the script got what was left in petty cash.
I appreciate my judgement could simply arise from culture clash though, since for me the longueurs, continual thousand-yard stares and go-nowhere internal monologues were as wearisome as what I imagine were meant to be the comedic scenes with the cook and the eunuchs (which to my mind just showed humour really doesn't travel). Worst of all for me was the depiction of the slave and harem women, and the characterisation of Alexandra herself who leapt from near-suicidal desperation into gagging-for-it whoredom via stupid acts of screaming pettiness which didn't deserve the name of rebellion. I know she had the dream, but I still found the transformation wholly unconvincing, and if she is meant to be an intelligent woman, gawd help us.
Having said that, it was effortless viewing, and though the CGI was amateurish that's never a deal-breaker for me; the settings were beautiful, the costumes suitably gorgeous, and the glimpses of Ottoman rule interesting (eg the literally kissing of the hem of his garments, the violent manhandling and subjugation of the Venetian ambassador). And Ibrahim was sexy as hell... So I may well watch another episode or two.