I think its true that more and more schools are moving toward graded legal writing, if for no other reason than more nad more firms are beginning to really emphasize LRW.
And don't be fooled by the number of credits the class is worth. It seems like most school "underweight" the grades. At Emory, it's sort of a prideful move by professors who teach doctrinal courses. They see legal writing as a "technical" skill, and the academics seem to feel like the technical is worth far less the the doctrinal classes. In reality, its probably one of the most important grades you'll receive, IMO.