In my opinion the problems with Hero Factory are;1) Marketing wise theres not much to collect other than the characters. Theres no extra mask, weapons, cores or anything of the such. Most people have the need to collect something and the more to collect the more interest there is in the product. 2) Super hero theme can only go so far. I know it's to appeal to a younger audience and focus on new fans instead of old, but after awhile it gets uninteresting. No matter how much story content you try to put in. 3) The Designs seem to backtrack once they hit Brain attack. The point of this is to probably "Start over" in a term and "upgrade" from this point if Hero Factory continues past its Brain Attack Arch. 4) Some of the designs are uninteresting and seem a bit hollow. The Torso piece for HF characters really takes away from the build of the characters in my opinion. This is because the back of the characters are exposed, Almost gives them a paper thin feeling. I'd say it has a few more years of selling, due to the younger audience. It has bright colors and some interesting designs that catch peoples eyes and the selling point of a TV show and books. While some of Brain Attacks designs are good, others feel like a reboot of sorts. (Mainly the Hero's) If Hero Factory should last for more than, lets say 2-3 more years. I personally think, they will have to improve the design and get rid of the mass amounts of negative space, while keeping the characters articulation. As for Ninjago and Chima I don't really know. I haven't payed much attention to basic lego sets in years. Chima looks strange though.