I have just watched "Mars Needs Moms" and I have no idea how it only gets 4.5 on IMDB? The story was so-so I'd agree, although at one point I honest to God had a lump in my throat, but the use of MOCAP was superb and there were parts in the film that I forgot it was CGI it was so realistic.
I'd give it above 7, perhaps 7.5 out of 10, but then I never get bored of good CGI as I can envisage just how much work goes into these films.