I can honestly kind of see why the popularity of the series started dying off around the last dozen or so books. They're not worse than what came before. Some of them are among the best.
But they are also intentionally uncomfortable. Moreso than the early series, even. The kids have to make desperate, horrible choices as the war becomes more open (such as the human morphs without permission and Ax and the nuke here). As a kid it was a lot.
I wondered before the reread if maybe it was because when I first read through I was getting to an age where I could better understand the darker elements of the books around this time that I didn't notice before. On the reread, though? I think it's just that the stakes escalate so much once Esplin is promoted to Visser One that the protagonists end up fast-tracked into their endgame spiral in a way that crept slower before. It's the shift to open war that moves their character arcs into hyperdrive and the choices get darker and weightier by the same measure.
As a kid it was off-putting to a degree I hadn't expected. It's entirely intentional that it's like that, but I can see why kids would start dropping out of the series from the tone-shift.














