I think about 2004 with the Toa Metru. I liked the idea of it being about the Turuga's stories but it just lost a bit of it's charm for me. I dipped back in for the 2008 Tahu Mistika, who I wasn't impressed with, the 2009 Glatorian Legends Mata Nui and finally the 2010 Stars Tahu and Takanuva rebuilds. Part of me is hoping that the rumoured Bionicle sets for 2015 are real, but on the other hand... do we really need a reboot of it? Surely they're fine with what ever similar brand they have at the minute.