TTT was always my least favorite book. Though I often reread FOTR, I seldom went on to TTT. Sometimes I'd skip straight to ROTK. So the movie had that strike against it, for me. As a Frodophile, I was really only interested in his story line. When I did read TTT, it was the half with Frodo and Sam.
FOTR had Frodo throughout, whereas TTT kept switching to humans and orcs, in a much too choppy fashion for me. When watching the movie, I sometimes skip the human, ent, and orc parts, leaving too little to satisfy.
I loved the Osgilliation. Not sure why, just a very viceral reaction each time I see it. And I liked Sam's speech.
I liked ROTK movie the least, as Frodo was whimpering and whining too much.
All said, though, they were great movies, and I've seen them at least 2 dozen times each.
EDIT TO ADD:
Voronwë_the_Faithful wrote:And Frodo absolutely was not offering the Ring to the Nazgûl.
I thought he was committing suicide (although he might have considered it as giving in to oblivion-of-self) and had quite a lively thread on that on TORC, some time ago.