I managed to see the last 30 min. of Pirates 4 due to theater hopping.

First, here's my opinions on the first 3.
Pirates 1- Good, solid, fun movie.
Pirates 2- Decent, but getting a bit boring and complicated for it's own good.
Pirates 3- Terrible and one of the worst big movies I've seen. Quite the mess.
I thought... Pirates 4 was MUCH better than 2 and 3, and maybe around the 1 movie. Still nothing amazing, but seemed solid and pretty cool.