Exactly.

Before he did it, I would have said that the Fellowship of the Ring was un-Filmable.

I have a few nitpicks with it but it captures the flavor of the book without too many major character changes. Yes, Merry and Pippen were made comic relief along with the dwarf.
But instead of changing things whole cloth and adding stuff to make the scene "dramatically interesting", in the FOTR, he had to just cut cut cut. There was too much material there to try to film everything and condensing things like Arwen and Glorfindel made sense.

In the other movies, he started adding nonsense that wasn't in the books. This is where he went wrong. All he had to do was stick with the story and characters and CUT where needed...

No. Even the lesser rings they had did corrupt them and brought Evil to the Dwarves. Sauron could not control them, the way he could Men so his plot "failed'. But research what happened to each of the 7 Ring Bearers of the Dwarves...

In Letters, JRRT says there are only a few beings in Arda that can control and use the 1 ring - pretty much Gandalf, Elrond and Galadriel.
You had to have Great Power yourself to master the One Ring. No mortal could do it and dwarves are technically mortals.

Every one else attempting to use the Ring would eventually fail and Sauron would eventually prevail. The Ring is part of Sauron after all...

No. Tom is just a doll that his children played with when they were kids. He put Tom in to amuse them. Later he denied that Tom was Eru (God) and that not everything in the LOTR should be explainable.

Interesting. It might be worth my checking out then. I dropped the game after Patch 3.0 or so when they ramped the damage up so high that Crowd Control became meaningless and every encounter was so easy - the hard part was looting the bodies.

Wow became just a tedious grind with no strategy or danger or excitement. Leveling became a real chore.