I found the first one funny. At least no one told me it was a great movie so I had no preconceived ideas about it. Hated the second one. Liked the third one. Recently watched the second one and actually liked it this time around. So, I guess it depends on timing or if you're interested in potty humor. I used to not be, but now I guess I allow myself to laugh at anything. Even dogs who run away dragging their butt behind them when you scare them while taking a shite.
Oh yeah, same thing happened for Spiderman when it came out. I had all these wonderful ideas of what the movie was gonna do that when I watched it I was let down big time. I hated the movie. Especially Tobey McGuire. But after watching it a second time I already knew what happened and I actually enjoyed it. Hmmm, go fig.