I thought the original movie was pretty damn funny. But that was like fifteen years ago and I really didn't remotely see the need for this sequel. That being said, it was pretty damn funny and had some huge laughs. But in all honesty - it was really just a redo of the first one and adding another generation to the family.
If you liked the original, you will certainly enjoy this one too. It's got plenty of laughs and family comedy. If you never saw the original, you should . . . . And then wait like 15 years and watch this one and laugh all over again.