I think the amount of time they decided to devote to Arwen in the movie was far more annoying.She was barely more than a sentence but the movie decided that editing out the greatest elf in Middle Earth (Glorfindel) to include her was best. I was also less than impressed with the lack of Imrahil & the Swan Knights not to mention poor Fatty Bulger getting nothing. I understand Bombadil's exclusion however much I loved him.
Sacrifices need to be made from page to screen, i get that & was able to get over most of the changes to enjoy the movies for what they were...
OMG WHO'S THAT ON THE HILL TO SAVE THE DAY!! ERKENBRAND!!! Wait what? What are YOU doing there? WHERE THE smurf IS ERKENBRAND JACKSON YOU! etc etc
EDIT: I agree with Mirial about Denethor. The Character was sooo much more complex than just the mad Steward he was portrayed. He was arguably the most intelligent man in the books. He seen right through Gandald's intentions & motives and knew everything before it happened. His will was so strong he was the ONLY man not to be corrupted to evil by the palantir, but instead made paranoid, suspicious & dreadful. In the movie he's was just a mad bastard...