Reviews provided by RottenTomatoes
New York Times:
Basically a tweener cable movie on steroids, with a bigger budget and a larger cast of B-list character actors.
Jenkins is a bit too McDreamy to play the geeky underdog, and adult viewers will be nostalgic for the chubby, bucktoothed and truly dorky cast of The Goonies.
Like those mild old Disney comedies of the '60s and '70s, it seems perfectly content with being a harmless distraction.
The ensuing war of the worlds is waged with weapons as fearsome as a bubble blower, a skateboard, and a sort of anti-gravity grenade that, frankly, looks like a lot of fun.
Unfortunately the child actors aren't particularly engaging, and the gags aren't entirely fresh.
San Francisco Chronicle:
It's doubtful that many people will be asking for their money back after seeing this movie. But they won't be remembering too much about it 24 hours later, either.
A forgettable bit of fluff that will zip out of your orbit as soon as the credits roll.
Fleeting charms are largely outweighed by an unexceptional script, a brace of shabby performances (from both kids and adults) and some dismal CG effects.
Aliens in the Attic is so thinly written by Mark Burton and Adam F. Goldberg that the characters are defined entirely by the actors playing them (or, in the case of the f/x-spawned aliens, voicing them).