I loved Bionicle, until they brought out the second wave of Bohrok... it felt like they were just pushing for more money at that point.
Kopaka was my favorite, because he was bad ass. And ice cool.
Arkbrik, thanks for making this post 'cos that was exactly what I was thinking to say.
I have most of the first wave, some creatures and 1 of the small ice warriors (bohrok?) I lost the black one at one point (thinking back I believe I traded it for... something) and never had the fire one, but I haven't taken the others apart since I first got them. They were some good toys, simple enough, durable, with sufficient backstory to make sense of it and not limit the imagination. The Bionicle games on the Lego site were terrible though. They used to have this path you could just keep clicking without going anywhere.