I haven't played LotFR but it does intrigue me. Same goes for Netrunner.
How does a LCG work? Every pack you buy is a functional deck, right? Kind of annoying then to get doubles if you do want them. But I guess they probably all cost less than the top performing card in any given MTG set.
(Just a note I've mostly only seen it abbreviated L5R.)
I haven't gotten into any other LCG, but I can explain how the L5R LCG has been released so far.
The core box came with one copy of every clan-specific card (there are seven clans and while making your decks you can only include your clan, neutral cards, and a very small amount of a second clan), two copies of every neutral card, and one copy of each province and stronghold (which you are required to have one copy of in every deck). The limit is three copies of any card in a deck. New packs aren't decks, they release with 60 cards in them, but they contain 3 copies of 20 new cards spread out across the 7 clans, neutral cards, and provinces.