Paul had some fun moments but it lacked the subtlety of character that the others had.
For me Hot Fuzz>Shaun of the Dead>>>>>World's End=Paul (the latter two are very different but I didn't enjoy either of them anywhere close to the other two).
Hot Fuzz tread so many angles very well and it was genuinely surprising, especially after how it was marketed. I think that might also be why some people don't like it as much. The previews I saw it came off as a non-stop action movie (and I wanted that), but it had a slow build-up and had heavy horror elements.
Shaun of the Dead is fun, but it is pretty on the nose and straightforward. Hot Fuzz shows them elevating many of the things that made Shaun of the Dead, but they took it to the next level.
World's End was a step too far though. Almost none of the characters were actually endearing, and it just went off the rails. Paul was just like a pale imitation of Hot Fuzz and Shaun of the Dead.