Of the 3 Clone Wars omnibuses, 2 is by far the weakest. If you, like me, consider the interesting villains and antiheroes that have come to define Clone Wars as being its strongest point (characters such as Asajj Ventress, Quinlan Vos, Grievous, Durge, and so on), then it's at its weakest when it brings in story lines that either don't expand at all on this, or otherwise dismiss otherwise memorable characters. The result? Some forgettable story lines.
The art is also inconsistent. The Yoda and then Grievous chapters towards the end both had very different art from the rest of the book, and series, and not in a good way. The Yoda art felt strangely computerized, fake, and shiny (much like the Prequel trilogy...) and the art for the Grievous chapter was almost juvenile, reducing could've been a compelling story into a kid's tale.
There are only two really important chapters, and only one of them is actually particularly good: the first is the one in which Obi-Wan learns Ventress' now somewhat revised (thank you, TV show) backstory. The second is the Battle of Jabiim, which is a fantastic story. The last one alone almost makes this Omnibus worth the price. Most disappointingly though, NOTHING INTERESTING happens with Quinlan Vos.
In the end, this Omnibus felt mostly like fluff between volumes 1 and 3, but it's juuuuuust important enough that you can't skip it all together. Worth a read as a Star Wars and Republic fan, but not the strongest the series has to offer.