I am curious. So far, it mainly seems to be that they were somehow more 'kiddy' than Transformers-probably due to the names. Names like Leader-1, Cy-Kill and Scooter don't really sound that memorable (of course, in an alternate universe, I'm typing that names like Optimus Prime, Megatron, and Starscream don't really sound that memorable on an Australian Go-Bots forum). Also, the Rock Lords, although there is probably some hypocrisy regarding their unimpressive alt modes when you consider Soundwave and Blaster-at least rocks don't get dated (well, they get carbon-dated, boom-tish).