I have mixed feelings about Adam Sandler movies. Some of the funnier ones include Happy Gilmore, Billy Madison, The Water Boy, and The Wedding Singer. Most of his other movies have some funny scenes that make you laugh, but they are not that great as a whole. Grown ups fits in with the majority of his movies in that it has some funny parts, yet it's only mediocre.
I give it 5.9 generous stars. I wanted it to be better, but it was a lazy and sloppy effort when it had so much more potential with such a talented cast. I'm just glad Adam Sandler doesn't critique me at my job.