I agree Orlando Bloom could've been replaced and, in fact, I wish he had been. I know teen girls go wild for him, but, damn, he is one bland actor! Not awful and untolerable, just bland, bland, bland.
I've seen The Lord Of The Rings trilogy, both Pirates Of The Caribbean films, Troy, Kingdom Of Heaven, and Elizabethtown and he's yet to impress me. He was the worst in Kingdom Of Heaven, Ridley Scott's Crusades epic. He played this noble, stoic knight with a conflicted soul and a world-weary attitude. It was a great, old-fashioned protagonist role and I bet many actors could've blown us away in it. He, however, just stood there with expressionless face (perhaps believing expressionless = attitude when it most definitely doesn't) and delivered these bold lines of heroic dialogue with the passion and fury of a log.
In regards to the Pirates franchise, I 100% believe if Disney had cast one of the actors I mentioned above (Ewan McGregor or Colin Farrell, for example) in the role of Will Turner, more people would pay attention to him instead of almost exclusively doting on the fantastic Johnny Depp's Captain Sparrow. Granted, most people would still leaving discussing the Keith Richards-inspired Sparrow, but I bet they would also remember Turner as more than the straightman to Sparrow, the crazy comic relief hero.
The rest of the cast is solid, especially Keira Knightley, who is a great young actress. She's solid as Elizabeth Swann in the Pirates movies and was
great in Domino and Pride & Prejudice.
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As for the overlong nature of Dead Man's Chest, I felt it the most during the first act. It felt as if 75 minutes or so had elapsed before we first met Davy Jones and he's the film's main villian! The set-up was too long and too uneven (though I loved the comedy involving the cannibal tribe). Once the ball started rolling, it was a blast.
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To those who saw Dead Man's Chest in theatres, did anyone else see the teaser trailer for Transformers? I'm not very familiar with the Transformers as their popularity was ending around the time I was born. This trailer, however, was quite good. I thought it was going to be an alien invasion movie, but then the giant robot showed up. Plus it's directed by Michael Bay, who is a great action director (his other credits include Armageddon, Bad Boys II, The Island, Pearl Harbor, and The Rock). Should be a good summer movie!