Sometimes it’s hard to know how to review an Adam Sandler film — or if it’s even worth it. The first “Grown Ups,” from 2010, earned a dismal 9% approval rating on Rotten Tomatoes ... and then went on to earn hundreds of millions worldwide.

Which means, of course, that we are now gifted with “Grown Ups 2,” about which I can say, well, it’s certainly no worse than “Grown Ups.”

Like most Adam Sandler movies, it’s exactly like most Adam Sandler movies. It was directed by Dennis Dugan, who’s contributed not only “Grown Ups,” but several other titles in the Sander canon (from the high of “Happy Gilmore” to the low of “Jack and Jill”). This movie stars all Sandler’s buddies and gleefully embraces lowbrow crudity even while promoting loving family values.

In other words, Sandler has no need to mess with the formula, so we should probably be grateful that the script (which he co-wrote) has enough moments of easygoing good humor to get us through the grade-school jokes about bras and bathrooms.

The biggest asset, of course, is the cast, whose offscreen camaraderie is evident in every scene. The filmmakers obviously know this, since they barely bother to craft an actual story line.