I'm going to make the polemical argument that this thread is lacking in replies not because the forum is very tree-ish these days, but because
Boro made the mistake of starting with TH:AUJ, which is the most boring entry in the PJ-canon. Unlike the LotR movies, it's not good enough to rally the movie fans to defend its honour. Unlike TH
OS, it's not a fun, wild--is it even Tolkien anymore?--ride. And unlike TH:B5A, it's not BAD. So the cavalry isn't galloping in to save it and its foes aren't salivating to skewer it.
My own TH:AUJ memories are slender: I saw it once in theatres and I haven't seen it since. I didn't
like it, exactly, but I left the theatre thinking it was basically another Peter Jackson adaptation: a little further down that road I didn't like from the mostly-excellent FotR toward the "I have a few more problems" RotK, but it didn't leave a strong impression compared with the movies that followed. And my memory of it is that there was more griping over the frame-rate than over the content (frame-rate was a bad idea, but I think the rewatching media are free of it).