Yeah, Barbossa woulda been great! Sparrow would have worked, too, now that I think of it. He coulda been praised for being the new Captain of the Dutchman, but still had a goal to retrieve the Pearl. Will becoming the new captain just didn't feel right, and I felt like... well I'll continue by replying to this guy...
I enjoyed this movie, but not as much as the first 2. I was also blown away by DMC, I just loved the direction and everything felt like the first movie to me. While this new one had quite a few cheesy elements to it, just like the examples you gave. I felt like they didn't give themselves enough time to write the script and go over it, and just rushed into it to finish the story. The reason I feel they rushed 3 and not 2(assuming they wrote both at the same time) was because 3 really did feel like it was hurried and 2 kinda took it's time, in a sense. Did they really plan to put a 100 ft woman while writing the script for the 2nd movie? I personally don't think so.
I was happy with the movie, I'd give it a 7/10, but I was really hoping for a movie as good as it's first part, DMC.