I’d say yes - evil. It just so happens that when fighting the Legion, it’s easy to be seen as the lesser of the two evils.
Also, you guys do remember that each cosmic force is governed by a pantheon*, right?
Without further information, we have no idea whether or not Xe’ra and her actions align with that of the Light pantheon’s consensus or a rogue, more extreme member of that said pantheon.
We’ve already seen two pantheons with member(s) that act against the roles given to them by the First Ones. Given that most of the times that we see the Light, it’s portrayed as fairly benevolent (with Scarlets, Yrel and her Lightbound, and Xe’ra being notable exceptions), it is entirely plausible that the actions of Xe’ra don’t represent the intended position of the Light.
She’s not even the first Naaru that we’ve interacted with at length, with A’dal being much more neutral, if not just outright benevolent.
It’s not even like we can take characters like these at face value when they refer to cosmological forces as a singular entity, since even Sylvanas shorthanded the Jailer as being Death**, despite his will not reflecting that of his Pantheon at large.
*Firim’s report, Expedition Report A37J - Part 4, gives us the line “Imagine, then, based upon the truths I have told you, that each of these rival forces could–and I stress could, for the fractals may yet reveal another path–be embodied by a host of transcendent beings as powerful as our own Eternal Ones”. Given that we know there to be an Order pantheon and a Life pantheon (something Firim wouldn’t have known about), it’s to believe that he is likely correct in this assumption.
**Sylvanas Loyalist epilogue, when referring to her bargain with Azshara in order to cause more souls to enter the Maw, she states “In the end, he too will serve Death.” in reference to N’Zoth. Notably, the in-game subtitles treat Death as a proper noun, and given her alliance with the Jailer, it’s likely that she is referring to him when she says Death.