I agree System portrays scenes really well, but I feel like a lot of the community, and myself to some degree, are just uncomfortable with the idea of System as a medium for a traditionally Technic theme. As for story-wise, Bionicle G1 2001-03, Ninjago 2011-13, and Bionicle G2, all follow the general plot: Elemental heroes (Toa, ninjas), led by the old wise people (Turaga and Mata Nui to an extent, Sensei Wu, Ekimu), fight a fallen warrior of darkness that's the brother of the old wise person (Makuta to Mata Nui/Ekimu and Garmadon to Wu), and in the end are saved by a hero of light (Takanuva, Lloyd, Ekimu). The story itself isn't the problem, as we have seen the general pattern spawn 2 long successful themes. It just matters if the story is simple enough to get into (try summarizing Chima), and interesting enough to keep following (Bionicle G2 boring?).