Yes, if it was just a standalone action movie with new characters, I could probably enjoy it simply for action and dumb gags. But they're using established characters I've come to love a certain way to tell what should probably be a standalone story.

The bluntest (and maybe the most refreshing) review I read was here: http://www.badassdigest.com/2011/05/16/movie-review-pirates-of-the-caribbean-on-stranger-tides-is-shit (and I didn't embed the link because - that's the actual title of the review itself).