I went by myself to see it, one because it looked so good and two because my kids will get REALLY freaked over really small things (well, my 9 year old DD does but my 5 year old is a brave girl!) My conclusion is no way in heck will my kids see this movie any time soon! LOL It is SOOO beautifully done and a really interesting story but uh uh. 90% excellent, 5% really sad and 5% basically terrifying. The really sad is the first half of the movie is Coraline basically being ignored by her parents, not NOW I'm busy, etc. I would hate to give away the scary part because I don't want to ruin the movie but there is a transformation that is scary and what the Other Mother wants, as a mom, just scared the carp out of me! LOL PM if you want details!
My DD9 loves all of the Back to the Future movies but once she saw Slimer in the 1st Ghostbusters, she was out of there. At the age of 9, LOL. So, I guess it really depends on your kid(s). Hope that helps!