Overall:
If you like Final Fantasy Tactics War of the Lion, this manga evokes that exact feeling and it's really great
Story:
For a manga which title sounds like a stupid one off, this one is actually great.
The isekai trope is used in great effect not to provide stupid exposition or making 4D chess moves, but merely to provide some extra context as to why MC acts the way he does, which is mostly reactionary. The world building is rich without relying on massive expositions like Mahouka, and it's focused more on political relationships than romantic relationships
Befitting a shounen MC, he has OP weapons with Deus Ex Machina that he gets to use when the proverbial excrement makes contact with metaphorical rotating aerial impeller, in turn allowing him to amass wealth which in turn allows him to just pay off whatever and whoever it is he needs to deal with. This is used to great extent to allow the MC to be a fucking asshole. In a way, it's like seeing a cheap chinese copy of Tony Stark and it's actually pretty enjoyable. Let's not pretend we don't like it when fucking Iron Man obliterates his foes with giant laser cannons
I like the fact that romance isn't pursued too hard, there's near complete lack of the MC being dense as the girls blush trying to say the million metaphors for "I love you". No bath peeping episodes, no swimsuit episodes, it's great.
I do however wish that political downfalls are explained better instead of being handled off screen
Art:
Art is amazing although the robot action sequences clearly could benefit from some more experience. Despite the important characters having clearly unique designs, the robots are surprisingly difficult to keep track of and melee combat in particular is hard to even process.
Other than that expressions are well drawn and the mecha designs themselves are actually pretty good
Also, personally the manga drawing is far more pleasant than the anime drawings, it's more shounen like. Technically the anime has more otomege look to it which I suppose is more appropriate for the setting, but it's pretty clear this work wasn't directed to shoujo market in the first place
Character:
First off, the males:
The MC is actually pretty basic "I'm a nobody but mess with my friends and I kill you" person. He's actually more akin to mary sue considering that not only he never fails, he's using 21st century modern philosophy of human rights, clearly meant to mean he's an upstanding person kind of like how Rose in Titanic is shown to be a progressive lady. He's got OP Deus Ex Machina, he knows it, and uses it every time he could to be as big of an asshole as he can be. In a way it's like watching Tatsuya from Mahouka except this time there's no incestuous sister clinging to him and he has more than 2 expressions
The 5 main males are actually well defined with obviously otomege characteristics but they are in fact presented as pretty normal human beings except being hypnotically smitten by the "lead heroine" and physically incapable of looking bad. They're never particularly important and interactions with them involves obviously otomege dialogue but that's part of the charm, a well balanced counter to the MC's douchebaggery so to speak if only to keep the MC from displaying his douchebaggery for a few pages
The heroines are.... well there's the obvious "shy, pure, innocent girl" that is Olivia but Angelica is surprisingly well written for a manga that claims harem tag. Unlike other female characters in other stories where the first time they're seen there's an exposition about how they're good in literally every fucking thing, Angelica is presented simply as a noble trying to look the noble part doing noble things because that's what nobles do, and she struggles with it. The impact of politics where there's no such thing as loyalty is used to great effect and the character grows organically at great pace
Enjoyment:
Just like Tatsuya and Mahouka, part of the enjoyment is watching the MC obliterating everything that comes his way with barely any effort whatsoever. The other part is watching the political intrigues, shallow as it may be, and the world building surrounding them. There's actually no 4D chess going on, the political intrigues are mostly shown on screen and for a silly harem mecha manga it's good to not have to wrinkle the brain trying to read between the lines