Am I missing something about Old Man's War? Everbody seems to think it's a great piece of contemporary SF, but to me it read like it was written for people who

Am I missing something about Old Man's War? Everbody seems to think it's a great piece of contemporary SF, but to me it read like it was written for people who read Heinlein as teenagers in the 50s, and whose worldview pretty much hasn't developed since. The science parts are handwavey plot conveniences, the books drop their main interesting bit of looking into the psychology of soldiers with 70 or zero years of life experience by treating the characters as generic clever 20-year olds, and the bleak xenophobic backdrop mixed with the juvenile war adventure plots makes the whole thing feel like a weird, unironic war propaganda piece.