One thing that bothered me
In the end the giant flying steel fortress fall over half of London, killing millions. Millions! I couldn't sympathize with the main characters and their inner family quarrel when their invention killed half of a city. And the part when the old professor whips up the amusement park is like adding assault to injury:
-Look kids! We killed your mommy, your papa, and eeevryone you hold dear. BUT! You can ride a horsey!
Otherwise I think this movie was very good, just not very appealing to me. Subjective score: 7 (although it may deserve an 8)