I'd like to point out i've only seen the new additions to the ride on video, so i'm not in a fair position to judge, but i'll still do so
while it's a pitty to loose the voice of Paul Frees that has functioned so well over the years, judging on the video, i think the replacement is not worse, if not better because people can identify more with the character from Barbossa.
Altough I'm not a big fan of the movie, I think most of the attraction changes didn't affect the overall experience of the ride, if not only enhanced it, because it includes the whole pirate world created by the movies. While Disneyland purists like us like to ride attractions in an original state, most people don't bother. And as I think most of the changes did do the ride no harm, I think the overall re-do is an improvement on the POTC experience for the regular visitor.
For quite a while I hoped they would once update pirates with a more exciting/darker soundtrack in some parts. We're way pass the gay sixties, and themeparks and their audiences have changed quite a bit, and I think trading some jolly-ness for a bit more adventurous mood wouldn't hurt the ride at all.
Even though I hate the mediaventures soundtrack in general, including parts of it wasn't a bad idea I think.
Though the rumours about the music from The Kraken really worries me, because that track seems too 'modern' to fit the ride (or a pirate movie in general, for that matter...)
There are rumours that some of these changes will make it to paris for the release of the third movie if they prove succesfull in the states (and if dlp's budget allows it), and I really hope it's true. I've been thinking that redressing one of the infamous swordfighters to Jack Sparrow would be quite a cheap and good change, allowable in pretty much any budget. And one of the fighters looks like Will Turner already anyway.