The dialogue, too, is absolutely spot-on. Filled with huge chunks of new conversation, Lair of the Shadow Broker puts Shepard into full-on ass-kicker mode and has him (or her, if you're that way inclined) mostly stomping around with comedy one-liners and sweet putdowns. One exchange, as Shepard and Liara are busy dodging bullets, debates why mercenaries always approach in dribs and drabs from various directions instead of attacking all at once: hats off to BioWare for turning a common conceit of game design (of which Mass Effect is as guilty as anything else) into an effective joke.
More important, at least for anyone yet to reach the endgame, are the various bonuses offered to you by completing the Shadow Broker's main quest. You're given access to some fancy computer terminals, and for pocket change you can have mineral-rich planets lit up on your map. Then there's the ability to dispatch teams of mercenaries out to faff about and occasionally bring back fistfuls of credits, giving you the option to perpetually cycle easy boosts to your economy and minerals.
On top of that, and perhaps more pertinent for fans of the universe's rich backstory, is a collection of dossiers that serve to flesh out the history of the game's supporting cast. Highlights include Miranda's online dating conversations, Legion's gaming records and the title of Jacob's most viewed porn movie. Which he watches while working out, obviously.
Without wanting to delve any deeper into potential spoiler territory, Lair of the Shadow Broker also takes a turn in a direction that can't help but affect Mass Effect 3. The predicable twist can be seen coming a mile off, but it's an undeniably satisfying way to advance the narrative, and will indubitably make Mass Effect 3 all the sweeter. You can't exactly say that about the Overlord pack.
But fans unprepared to shell out any money will, other than missing out, be happy to know that this doesn't put a neat and tidy bow on the whole Shadow Broker storyline. It plays with the characters, teases a few conclusions and ultimately leaves you left wanting more. It might not be too cheap at 800 Microsoft Points, but it's an exciting and cinematic ride while it lasts.