Before the massive success that was Bionicle, Lego tried a couple other things. Roboriders and throwbots/slizers were the precursors to the legend of Mata Nui and his kin. These lines were unfortunately doomed to fail. Or maybe it is fortunate because if they had succeeded we would not have Bionicle.
Does anyone have any fond memories? And why do you think these lines failed? If we look at the sets just as they are (ignoring ALL comic book related marketing and story support) and compare it to 2001 Bionicle, why do you think Roboriders and throwbots/slizers failed to take off?