"Even-handed"? Not from what I've seen. Morera seems to imply a view held by "the academy" that really doesn't exist, and is largely a product of segments of popular literature.

There is a thread from a neighboring subreddit here: Dr S.J. Pearce discussing the 'Myth of the Andalusian Paradise' by Dario Fernández Morera

But maybe these are the same reviews you reference.

From Pearce:

Politics and religion aside, Fernández-Morera’s project falls victim to a major flaw in its very conceptualization. There is no serious scholar working today, on any point of the political spectrum, who thinks that al-Andalus was any kind of “paradise.” The Myth’s myth is itself a myth. By challenging an imagined narrative of peaceful, happy, multicultural tolerance with a narrative of Islamic depravity and Catholic supremacy, he is not really substituting a badly-constructed narrative with the correct one but instead replaces one fiction with another that better suits his political and cultural commitments. As David Nirenberg has observed, “When we turn to history — medieval or any other — in order to demonstrate the exemplary virtues of a given culture or religious tradition in comparison with another, we are often re-creating the dynamics we claim to be transcending." In this case, Fernández-Morera is replacing his perception of a left-wing fantasy with his own right-wing and Catholic fantasy; rather than replacing a fiction with inconvenient truths, he is in fact attempting to replace one fantastical narrative with another, casting scholars of medieval Spain as the cartoon villains in this scenario for an audience primed for the image and fantasy of the (allegedly) liberal, academic, historiographic scoundrel.

It would appear that in "debunking" a supposed myth, Morera simply substitutes a new one that is more to his political liking.