This is actually quite a good introduction to L5R for a group that has very little (or no) experience with the game. It does present a heavily cut-down version of the rules (and a small grimoire-worth of spells for the shugenja) that makes getting to play a swift experience. There are enough rules to play out the entire module, and they capture the flavour of the system very well. Groups wanting to continue will need to purchase the rulebook.
The story in the module is, on the surface, very simple, but in true L5R style, there are many layers to peel back. It is possible to cruise through the module in a linear fashion, but there are a wealth of opportunities to engage with the social structure, etiquette and customs that make Rokugan such a rich setting. There are political and face-saving schemes afoot in the background, with plenty of clues and opportunities for characters to chase down leads (in a respectful manner, of course). There are a number of ways that the plot can be resolved, all with their own ramifications and enough meaty choices for philosophical souls to mull over.
The only detraction in this was the way in which the pregenerated characters are set out. they simply run on from page to page, and cutting them out to hand to players is a nightmare. I would strongly suggest that AEG take a look at how Catalyst handle their quick-play characters. Catalyst presents double-sided half-page characters with a small illustration; with the sheets easily cut, or torn out and distributed. Not so with this AEG product.
that said, this issue isn't insurmountable (more an annoyance), and the quality of the module more than makes up for it. I'd highly recommend this to absolutely anyone who has ever looked at L5R and thought 'it looks interesting...' It is indeed, and this module showcases why.