70

L.A. Weekly

Sandler crony Allen Covert, the star, producer and co-writer of this stunted-adolescence classic, hilariously explores a previously untapped nexus of stoner humor, joystick geekdom, elderly women and a martial arts-taught chimp.
Full Review
40

Austin Chronicle

By Marc Savlov
Stupid, yes, but fun nonetheless.
Full Review
40

The Hollywood Reporter

By Frank Scheck
The film doesn't have much in the way of genuine laughs despite a plethora of attempted gags, but it does have a geniality that makes it hard to entirely dislike.
Full Review
40

Film Threat

A touch above the usual adolescent male friendly films of Happy Madison's previous on-screen massacres (see "Deuce Bigalow: European Gigolo" for example”) but it isn't quite as smart or funny as other recent comedies like "40 Year-Old Virgin" or "Wedding Crashers."
Full Review
38

The Globe and Mail (Toronto)

By Liam Lacey
An Adam Sandler movie without Adam Sandler, it turns out, is not necessarily an improvement.
Full Review
25

New York Daily News

By Jami Bernard
There's no drug potent enough to make Grandma's Boy worth 87 minutes of your life.
Full Review
25

TV Guide

By Ken Fox
Lacking so much as a shred of wit and crammed with more product placements than jokes, this unendurable stoner comedy clearly disproves the movie-formula wisdom that two guys, one Xbox and a 2-foot-long bong add up to something funny.
Full Review
25

New York Post

By Lou Lumenick
A pathetic stoner comedy.
Full Review
25

Entertainment Weekly

Does a very thorough job of reducing every recognizable member of the cast to probable career lows.
Full Review
12

ReelViews

By James Berardinelli
This is one of those movies where you stay rooted in your seat just to see how bad it can really get.
Full Review
33 out of 100
Generally unfavorable reviews
Metascore® based on all critic reviews. Scores range from 0 to 100, with higher scores indicating more favorable reviews.