Judged as a comedy, Frankenweenie isn't really that great. The humor is rarely more than mild. But the movie actually did a pretty good job with the story, which is well paced and has moments of genuine - if mild - suspense.
It's also - and this is to be expected from any Tim Burton movie - really good looking, with stylish black and white animation and a cast of creepy looking kids.
As someone familiar with the original movies, I appreciate the way it pays tribute to its source material. It is also wonderfully imaginative, most notably in the first resuscitation scene.
One criticism; even by the standards of kids cartoons or old horror movies, this thing makes zero sense. The lack of any sort of logic is, however, so in-your-face that I accept it as purposeful and thus just accept that this is a movie that's not supposed to make any sense.