What warned me off was the appalling research in to some of the countries (China and Japan banding together in to one one country, what? after what Japan did to China in the 'thirty's and 'forty's, south-west Asia being led by a Khaliph - sorry, but what?)
executed in-story by the immortal mutants with catlike eyes
Ah yes, the "Caliphate" and "Chipan", backed up by constant reminders of how weak they are and massive worldbuilding, executed in-story by the immortal mutants with catlike eyes (yes, really) to make sure the protagonists are never seriously challenged.
I recall finding the actual WW2-era stuff okay, other than bombing aircraft having spirits/ghosts/something that talked to flight crew. I'm not imagining that, right?
My recollection of the story arc is that they ended up with a world far, far shittier than our actual immortal-free world. Maybe the setting didn't need or benefit from those characters at all.
I recall somebody else contributing some really awful, xenophobic shit to that franchise. Some big insurrection by Muslim immigrants to North America/Europe, which had the Canadian community boiling to death captured RCMP or thereabouts.
I didn't read the TL itself
I did read it, and actually even read a bunch of that terrible series where Heaven and Hell go to war with humanity.
Nah that was Proof Though The Night by ChaserGreyLet's face it, it was the only reason to join stardestroyer.net.
You didn't have to go past this.
If you want to piss-off Stuart Slade, just tell him about the realities of the Convair B-36 maintenance and the aircraft flaws. That aircraft was pretty impressive and made an honorable career, sure, but maintenance and reliability wise - it was a dog of an aircraft. With six R-4360 there were dozens (if not hundreds) of spark plugs in the engines, to the mechanics delight. Plus four early jet engines, unreliable and very flamables and explosives and fuel guzzling. Ten engines, no less. It took 10 hours to prepare a B-36 to fly. Early models were so bad, the program was nearly cancelled in 1945-46.
More generally, Slade extrapolates flights of hundred B-36s from OTL WWII B-17s and B-24s. But from B-29 onwards aircraft complexity (and unreliability) grew so fast, number of aircraft in raids fell accordingly. They were also more destructives.