Update: I forgot the worst. FileVault 2 + HFS+ corrupting metadata and becoming un-fsck-able (Repair). TimeMachine restore and 5 hours loss per incident.

Also Xcode 6.1 took a week to fix a docset feed bug that they duplicated a docset dmg url. I found the exact correct dmg url, and it still took 3 days to fix. Everyone had broken Xcode Tools docsets until they fixed it. (!)

iBooks can use 100% CPU trying to connect to the (nonexistent) internet when reading an ePub.

All-in-all, these aren't show stoppers, just a collection of things to whine about. It would cause more happiness if they were fixed, but they're mostly navigable.