Just Visiting is an American remake (starring the same two main characters) of the excellent French "Les Visiteurs" from 1993. The remake is of course not on par with the original, which is a perfect comedy. The U.S. version is much duller, and marred by several things, such as Jean Reno being too old to successfully reprise his role, and many jokes simply not being very funny.
It gains, however, on two important counts. First, Malcolm McDowell's wizard, who has a much larger and more interesting part in this movie than the original wizard did in the first movie. Second, Christina Applegate's character. She is surprisingly good, and a delight to watch. She's never been a terrible actress, but here she's extraordinary. She plays a kind of good-hearted, intelligent and yet naive character that, to my knowledge, is quite different from the other characters she's played. Where she's often been an air-head bimbo, here she's genuinely appealing; even endearing.
It still does detract from the movie that, to a great degree, it merely goes through the motions of the original movie, trying to mimic the jokes and japes, and very often failing miserably. Still and all, it's worth watching and is better than it might have been.
I rate this one 7 out of 10. You should see the original, though, which is far more inspired and also gives a great impression of spontaneity. I rate the original version 10 out of 10. It's that good.