I just about wet myself when I saw the scene witth the Balrog. I'm pretty sure when the Balrog stepped onto the bridge of Kasah Dum, I made the touchdown sign with my arms. It still to me is just incredible.
LOTR is one of the few book to movie adaptations that I love equally. There are differences, but I agreed with Peter Jackson on pretty much every thing that he adjusted or changed.
The Two Towers is a masterpiece. The Battle of Helms Deep is awesome. The Ents were so cool.
And in ROTK the scene were Eowyn kills the Witch King and then her goodbye to King Theoden was incredible.
I think every casting decision was spot on. The attention to detail in the sets, the weapons and costumes were just amazing