I'm very fond of this series. I like the characters, I like the setting, I like the writing.
I like the story arc - how Roger grows from this spoiled little titweasel to a great man, a great leader. I love how the company grew together, how the aliens integrated into the group. I adore Cord, because sometimes the best thing you can do for a future leader of men is hit him on the head when he's being a tit.
Like I said, I really enjoyed this series. I enjoy it more every time I read it.
And John Ringo and David Weber are such complementary authors. The story moves more quickly than Weber's usual writing, with very few mid-scene interruptions to infodump imaginary weapons tech (Ah, David Weber, never change). At the same time, it's definitely got a more measured pace than what I've read of Ringo's writing (which, admittedly, has so far been only his zombie series) and less of a tendency to include random events just for shits and giggles, as he appears to be fond of doing. The plotting is tight and if there wasn't a massive outline somewhere, with maps and timelines, I'd be very surprised indeed.
One thing that pissed me off was the massive space battle digression near the end of the last book. I get that we need to know what happened to the Dark Lord of the Sixth and his forces, but seriously? As I was reading it, I kept thinking "I bet David Weber said he was going to quit the series if they didn't let him write at least one space battle". It was too damn long, and placed as it is, it encourages skimming. We want to know what is happening with Roger, dammit, not some space bros we didn't meet until a hundred pages ago! TELL ME WHAT HAPPENED TO MY ELF BOY.
Seriously, this is a seriously pocking good series. If you like military SF, read it. If you like castaway stories, read it. Intrigue? Go. Plotting? Go. WAR? Go. If you like a clean romance where sex is mostly just implied, read it for that too (and that last point kind of pisses me off. I mean, is there a reason why we can't have decent sex scenes in the really good SF books? Is there some kind of law and nobody told me? Where, I ask you, is the Kushiel's Dart of the SF world?)