I'll be honest, this was a bit of a letdown. That's not to say the book is bad (it isn't), but of the three Farscape novels that were released, House of Cards, as far as I can tell at least, has the reputation of being "the good one." That, and I generally like DeCandido's work in other IPs, including the Farscape comics. This, however, is just fine.
Part of the issue is the setting. Liantac is little more than a "casino planet," and for a series as imaginative as Farscape, it feels a bit bland as far as choice of setting goes. The lians in question are decent, and since this isn't live-action, the storyline allows far more aliens (not including sebaceans) to show up than a typical episode would. That, and DeCandido's handling of the characters is on point, though some get more to do than others. Ironically, Rygel probably gets the most important role in a sense, despite being confined to his ThroneSled.
So, again, House of Cards is fine enough as tie-in fiction goes. It just doesn't have that 'extra oomph' to propel it to four stars. I've seen some people say it could fit right in as a two-parter episode, and while that may be true, it wouldn't go down as one of the all-time greats in the series, nor is there anything in here that's required reading. The characterization is good, especially for John and Aeryn (John has to confront the weight of being away from Earth for so long, Aeryn is drowning in guilt over her PK past), but at the end of the solar day, it's just...fine.