Hm... I seem to have won the new version, as far as it goes. Probably just a bad seed for the sector generation, but I wiped out the local orcs before a Waaaagh! could get off the ground, no Tau, no Eldar, no tyranid, and no chaos cults. There are one or two necron tombs identified, but they've stayed asleep for 200+ turns. The inquisition asks me to send a ship filled with marines here and there every so often, but arriving at the designated star seems to be enough to please them.
This seems to describe my game too. (I'm playing Blood Angels as well.) Lots of Ork invasions, zero of anything else going on. No corruption to speak of, very few events. The most I've seen is a WAAGGGH event, a Warp Storm event, and a "Someone in the Mechanicus doesn't like you" event. I keep reading other people's games with all the crazy shit going on, and it makes me wonder if the canon chapters have some sort of scenario presets. It seems like making a custom chapter, you're bound to see way more happen than with the Blood Angels who basically have no downsides or weaknesses other than the Black Rage. I've managed to go 40 turns and clear three heavy infestations and not lost a single marine. Granted, I have about 30 Death Company spread across the whole chapter, and several critically wounded scouts and what not...but they're not dead. Their healing rates seem atrociously slow though, at least while on a ship. Maybe that has to do with the # of Apothecaries on the ship.
They really need to change battle messages to differentiate people who are killed from those who are critically wounded.
editTurns out Librarians do gain xp. But it seems to be based on whether or not they get a kill, since I have Librarians with 1 or 2 xp over their starting amount. I also see them referenced in the army description when you've got few enough special troops it takes the time to describe them. So the game knows they're there, it just seems they're doing anything particularly special that we know of.