Can you remind me what prologues were in AUJ? I only watched the movie once. Is Radagast's plot unrelated? He did go to Dol Guldur which is very much related to the plot.
Maybe both the Bilbo prologue which begat the Dwarven/Erebor prologue? You can consider them both one big prologue, I guess.
I just finished watching the EE and... yeah, I dunno. I do believe the movie has pacing problems. And the whole tone is a bit conflicting - it's like it tries to be both a lighthearted fairytale and a serious epic adventure in the LOTR mould. And it can't be both, so it fails (in a sense) because the "seriousness" tarnishes the fantastical elements so to speak, but you can't also take 100% seriously a movie with a singing gobling king, a trio of arguing trolls with thick accents and no real urgency to the plot.
That... and some of the effects. Now, don't get me wrong - most of them (especially Gollum!) are simple amazing. The problem I have is that a lot of things look... well, fake. In a sense. Not because they're bad effects - but because they look like they don't really belong there. No weight, no wear, no effect on their surroundings. Then again, the LOTR trilogy also had effects like these but... I dunno, it seemed they were better placed, so that they didn't overwhelm the rest of the movie.
All in all I still like it. I mean, as I've already said, I'm too much of a fanboy. But it doesn't hurt to be a bit critical, huh?