What's going on with parts 3?

Rating: Null/10 (19 June 2007)

I have been watching the third installments of three major franchises, Spiderman, Pirates, and Shrek, they all sucked!!!
The last time we had a good third act was with Star Wars, Revenge of the Sith truly improved Lucas's mediocre Episodes I and II.
I'm not counting The Return of the King, because as Peter Jackson said, it's all a very big over 9 hour film divided in three, and besides the literary work was there since the 50's.
But it's a real disappointment that all of the above movies turned out so bad, Spiderman and Spiderman 2 were good films, filled with action, drama, comedy, tragedy, and triumph, but 3 was just too much coming and going without getting anywhere. I never liked Pirates 1 and 2, but at least they were watchable, At World's End is one of the worst movies I have ever seen, I nearly walked out halfway through. Shrek 1 and 2 were very original and funny, but they lost it with these one.
It seems Hollywood is more interested in the mega super-production, and marketing targets and promotions for its third installment films, but they are completely forgetting quality, character development, good acting, good stories, and even good action!
How I wish Peter Jackson makes The Hobbit or The Chidren of Hurin happen, because ever since the Lord of the Rings Trilogy, and a few others from franchises (Revenge of The Sith, Rocky Balboa, The Goblet of Fire), the sequels or prequels, have been turning out to be total excrement!