I've really liked the First Legion since Savage Weapons. In Descent and Fallen Angels, they just seemed really bland and very generic, the novels themselves were also very poor imo. But since ADB got hold of them, they really seem to have picked up a lot more personality and flavour. The whole knightly aspect of them wasn't really realised very well in the first two novels, but was then made more distinct from Savage Weapons onwards, without being too blatant though I might add. Dan has continued to do well with them in Unremembered Empire. I won't even begin to add how drastically the Lion changed once ADB and Abnett took charge either, for the better.