I think it is important, for what it is worth, to post my satisfaction with Decipher's LotR rpg line. I have read most of the books in the line so far (up to "The Two Towers" supplement) and I am most pleased. While some of the books have noticeble errors, I am equally pleased with the fact that Decipher has made great efforts to correct these through a continuely updated errata.
For specifics, the Moria boxed set, as others have mentioned, is what I would consider the best supplement in the line thus far. How the designers approached detailing an area as large as Moria and its surrounding underdark was ingenious (and most applicable to just about any "dungeon"). For the first time in a long time I was completly satisfied in an rpg supplement I purchased. And that is saying a lot because I am very critical of the rpg supplements I buy. I always seem to place unreasonably high expectations on rpg supplements.
Once again, I offer a big thanks to all at Decipher responsible for the LotR rpg (that also includes support people such as Doug Burke). And I hope for a long and productive run of this great rpg line. Keep it coming!
Eric Dawson