Morangias said:
From what I recall, that's an overstatement. BAs were fighting Necrons on some planet, both sides caught up in a long war of attrition, when the Tyranids came. Both sides then ceased hostilities to deal with the more immediate threat that the Nids posed, and when they were finally done with them, neither side had the strength to keep on fighting, so they both retreated. Not the most glorious day in the annals of the Blood Angels, for certain, but neither was it as stupid as the /tg/ makes it sound. There weren't any negotiations or official cease fire orders on either side, it was a simple common sense of ignoring each other until the mutual threat was managed.
It makes even more sense now that we know the particular Necron Overlord the Angels were facing is a guy who never passes up an opportunity to kill him some 'Nids.
The issue with this incident comes only from the very last line of the description, where it states that even if the Blood Angels had the strength and numbers to fight the Necrons after beating the Tyranids, they wouldn't because they found, "the idea of turning on those they had so recently fought alongside a distasteful one." The implication of this statement are that they didn't just fight next to one another, they fought with one another. Meaning even if the alliance was impromptu, Dante and the Silent King spoke to one another and reached this agreement, rather than both armies simply turning their guns on the bigger target. This rubbed a lot of people the wrong way and if this last sentance had been removed, this piece of fluff wouldn't have gotten half the flak that it recieved.
That said, I've been extremely happy with the Necron codex. From an RPG prospective, the players are almost never going to interact with the crazy Overlords. It's the lesser lords and nobles and crypteks that are running the show, and I feel the majority of them are perfectly capable of functioning just like the old necron lords if desired, or can have well thought out, intelligent plans for players to foil. What's more, the political maneuvers of lesser lords against one another within the same dynasty, all occurring right beneath the player's feet, could be the plot of an entire campaign.
This also rewrites a lot of what appeared in BFG as well.