XENOCIDE

   Oh, Randall... http://xkcd.com/304/

   No, but Xenocide really used to be my favorite too. It definitely had to do with the Chinese culture of Path. Han Qing-jao is a "godspoken," a genius-level caste to whom the gods allegedly manifest their will, through the form of rituals. Spoiler spoiler spoiler, it turns out it's just a plot by the Starways Congress to have a hyperintelligent task force they keep in line through debilitating OCD. Qing-jao is tasked with figuring out how all outside communication was cut off from a fleet of starships heading to destroy the planet Lusitania, which houses a deadly virus. She deduces the cutoff was caused by something of a virus itself: a sentient ghost in the machine whom we know to be Jane.


THE GOOD:

1. Path would give Xenocide a unique flavor of all the films. I'm thinking even sepia for these sequences. At least the prologhue, when Han Qing-jao's mother dies. Others are out in space, the feel of this one could be more grounded.
2. The return of Valentine. 
3. The scene where the death of Quim causes Grego to inspire an angry mob. Heartbreaking.
4. The death of Planter, sacrificing himself to prove his species sentient without the virus they carried, to prove that replacing their virus with a synthetic wouldn't render them mere animals again.

THE BAD:

1. Miro's slurred, slow speech wouldn't be very good on film. Oh, I know, they could just have Christopher Nolan direct this one!
2. After revisiting Ender years later at the start of Speaker for the Dead, he's 30 years older again this time around!
3. Problems with Outside, which we'll get to soon.
4. Younger Val and Peter's actors will have aged by now.

THE UGLY:

1. There's a chapter there, just a long conversation about old seemingly disproven science that turns out to be correct. It's quite talky, but it's essential to the entire story. This is a great but necessary leap, as after that Jane is allowed to take people into Outspace.
2. Speaking of, the depiction of Outspace itself. It exists outside of space and time, so if you beam your ship into it, your ship takes up the entire universe. They're bound to run out of camera angles eventually, especially considering ships designed for Outspace travel are small and cramped.