I enjoy watching the Goosebumps videos with my son and husband, although I enjoy reading the books to my son more. While my son is 6, younger than the usual Goosebump-fan age, he does like the Goosebump videos and books.
Stay Out of the Basement was entertaining albeit a bit hokey. However, the hokiness seems to draw younger viewers in. This is the story of the scientist-father who, while attempting to get his university job back, develops new (and terrifying!) plant life.
The Haunted Mask was less hoky and really fun to watch. It is a bit spooky, especially the idea that the lead character, Carly Beth, becomes "possessed" by the haunted mask. Still, love saves the day--nicely providing excellent grounds for good discussion with your children about the importance of family and love.
Night in Terror Tower actually spooked my husband and me! Eerie images and spooky music work their magic while you view this story. The whole concept of traveling through time works nicely with the good (the children) vs. evil (the Lord High Executioner) concept. Some of the build-up to various scenes can be a bit intense for younger viewers, though. If you're into English history or Shakespeare, you'll recognize a wonderful correlation with King Richard III and the young princes he allegedly murdered while they were imprisoned in the tower.
Out of all the Goosebumps videos I've seen, I would say Night in Terror Tower is one of the best, if not *the* best.