Well as a slasher I know I want lots of sexy and hot Harry/Draco action that just wasn't in any book or movie *pouts*
I would have liked it if they showed us Dumbledores funeral. I would have also liked it if they didn't gloss over Fred's death, I also wish they could have explained more about Snape and his story in HBP.
Also in DH I would have liked it if they would hve spared a couple minutes for Dudley to redem himself.
In all seriousness though if we could have just seen Harry and Draco kiss(Dozens of times) all would have been forgiven ;)