I'll defend Turtledove based on the fact that (thanks to the British Education System, but that's another rant) most of what I know about WW2, I first learned from his Worldwar books...
I think Flocc hit the nail on the head when he said that HT now has such a status that editors don't dare edit him. There's even a bit in the last Settling Accounts book where there are literally two duplicate chapters. Who knows, maybe Videssos and his other good books were originally brick-sized redundant drafts, but back then he actually had an editor to turn them readable.
I still read Turtledove books, but only when I can pick them up cheap, and I find they're a good way of turning off your mind before you go to sleep (I'm not being snarky, that's actually true).