I took my DD6 and DS4 to see it this morning. From their point of view:
DS4 liked it better than Zathura and thought it was funny but the alien robots and the invasion was scary. It was good but not brilliant.
DD6 also said it was a bit scary and it was quite good but not the best Disney film ever. She found some of the characters annoying and rated Zathura a better watch.
I thought it was a good effort from Disney and I liked the characters, music and comedy that went over my kids' heads. I did think that the alien invasion was a bit odd and seemed to not flow into the plot very well but it righted itself by the end. A good watch but not their best ie. we all loved Lilo and Stitch, Lion King, but this wasn't quite there.
Hope this helps,
Claire xx