Half assed harem aspect -
Disagree. The harem aspect of the game (Emily+Katie+Akane/Molly/Bella) is
different in nature than the typical harem fare. The concept and behavior of the Chosen is rather unique in that regard and while it qualifies as a harem it is also something entirely its own. Katie specifically is a Lancelot figure. Other relationships are ancillary and technically optional.
Emily Romance -
Partial. I found Bella and Katie more organic and compelling. Molly next, then Emily, then Akane. To me, much (but not all) of Emily's romance had a bit more mechanical feel to it despite more time being devoted to it. Never really been able to put my finger on why. While some of that shifts around depending on the day and my BAC, to me the Emily romance simply isn't the shiniest of those ornaments.
Overpowered Fate -
Partial. The fate aspect reads to me as actors such as Merlin and The Horned Lord seeing probabilities and preparing for contingencies. The Voices (an actor that stands outside the flow of time) is more of an amoral factor in the story that sees and wants things to go down particular paths and nudges things that way, but can be resisted. The MC's struggle for the outcome he wants vs one just
good-enough for those fateful actors is a key aspect of the story. You are seeing the world as it goes down one path, but if that outcome was assured Gate would not be sitting on a magical nuke ready to blow bits of the protagonist to Hel.
MC Overpowered -
Partial. The MC isn't really overpowered in context of the struggle, Droid has made clear Owyn isn't the most powerful of the gods even now, he is just among them. But he
feels overpowered in play. Droid made the design decision to reduce/eliminate the option/consequences of failure. It felt (to me) more like you could lose, particularly early in Book 1 development. This is not a bad design decision, but it is a trade off that does lose something. There really aren't options for screwups, bad choices, combat failures etc. leading to 'bad-ends' and it seems unlikely to be a direction he will take the game.
YMMV