Good thread idea!
I prepared myself for Pirates 4 by watching all 3 previous Pirates and I just went to see Pirates 4 yesterday!
Pirates of the Caribbean: The Curse of the Black Pearl - 8.5/10 (Delightful Jack Sparrow still full of mystery and surprises, good plot with unexpected twists, amazing soundtrack)
Pirates of the Caribbean: Dead Man's Chest - 8/10 (More of the same, Davy Jones is awesome, Jack Sparrow doesn't have as much of a good role in the story but he's still great)
Pirates of the Caribbean: At World's End - 6/10 (Very confusing plot, the amount of characters casts a huge weight on the movie, only Jack Sparrow can be funny, Will and Elizabeth must go)
Pirates of the Caribbean: On Stranger Tides - 7/10 (Got ride of most of the characters which is a good thing, a simple and good plot, Jack Sparrow is back to being great)
And now I'm preparing myself for X-Men: First Class.
X-Men - 8/10 (Simply a good movie)
I liked all of them despite having some preferences.