I actually liked Grown Ups but this wasn't very funny.
I found Grown Ups pretty funny and worth a repeat viewing here and there. This movie however, did have a lot of jokes that fell flat on their face. There was one scene that made me laugh my ass off, and I barely let out a smirk the rest of the movie. Not very entertaining, just barely enough to watch to the end.
By the way I do still find Adam Sandler and most of his movies funny. That's My Boy, Just Go With It, Grown Ups, Funny People, even Zohan. Funny People was terrific. I don't think Adam has lost it at all, but this movie is one that fell short for sure.