I found the first one shocking, probably because, at the time, I was a very sweet, innocent little 14-y.o. (how things change, lol.)
The second one wasn't worth watching, really. A couple of amusing moments though.
The third one was HILARIOUS. Man, it cracks me up everytime. SO I was expecting good things for...
Scary Movie 4, but aside from a few funny moments, it didn't deliver.