Why did you think Frodo and Galdalf were underminded? I've never heard that one before.
Gandalf as explained above^. Yes he lost his staff a bit too easily. Taking that away from a white wizard that easily - made his threat lost it's power.Frodo was a too young and a little less heroic overall, though he did get some other scenes to ''shine'' but unfortunatelly one of them made Gandalf look like an idiot, as for Gandalf I think she mainly means the (for me) worse part of the trilogy when the Witch King destroys Gandalfs staff, when by rank (or species or whatever you want to call it) Gandalf is equal to Sauron himself
I didn't really mind the additions of elves or the absence of Tom since I have no idea what they would do with him as it would only slow the movie down, what I did mind is the absence of the sons of Elrond, the rangers from the north and the altered storyline of anduril and a bit the army of the dead
but I learned to live with it because LoTR is a very high-quality movie (even the academy agrees with me fully) and is so obviously superior to the Hobbit movies it's sad to think PJ's quality dropped this much
Frodo never accused Sam of stealing food from him. He never trusted Gollum more than Sam. If he listened to Gollum it was despite it because he saw no other option. Only time he acted harshly with his friend and gardner was towards the end when ring was getting powerful and Sam offered to carry it for Frodo. And even then he realized quick enough that ring was beginning to turn him and he apologized to Sam. Frodo's trusted Sam above all and their understanding and trust in each other was what kept them on the path. It also reflected on Frodo's silent bravery and maintaining his sanity and will power almost to the very end and I didn't like movie taking that away from him. There were enough dramatic scenes in the book to avoid that kind of cliche/ typical Hollywood episode in the movie.