The only John Ringo books that have truly bothered me are the ''Ghost'' series of novels which market themselves as some type of Splinter Cell/Tom Clancy style action but are in reality very bizarre BDSM and rape fantasy stories. I think that's the first time I've ever been tempted to throw a book in the trash, moreso at the heinous bait&switch than anything.
See for more details:
http://hradzka.livejournal.com/194753.html
Overall I think he has some decent ideas but I don't think he's a very good writer at all on his own.