Although being very successful and lucrative productions, story line is really weak and simple. However, I think it's visuals that attract most viewers. Personally I like to re-watch those movies from time to time, just to see amazing robot animations that those VFX guys did. Getting more familiar with 3D software made me appreciate the work those people did even more, as it's very difficult and time consuming task. Also robots re-desings are very interesting and fresh, with great amount of little moving details.