I like the bohrok kal as sets and concept. They were menacing, powerful and brought a bunch of cool new elements to the bionicle universe (gravity is my favorite element in the series). Although I do think there is a problem with them story wise. One of their defining features was supposed to be their distinctness and sentient personality but to me they still come off as super drone like, and honestly kind of dumb contradicting that feature.
The thing about the bohrok is that usually they would be good guys, but in their first appearance they unintentional threaten the GSR by destroying mata nui. This works because they are mindless drones and and unlike the toa can be seen as the GSR’s natural immune system, emotionless and automatically attacking anything it considers a threat, even if in the current situation it ends up doing harm instead of good like how allergies are caused by an over active immune system.
But the Bohrok kal are supposed to be sentient and yet they still don’t realize they endanger the great spirit by cleaning mata nui, and the fact that their speech is rather deadpan to me they seem just as drone like as the normal bohrok even though I think that’s the opposite of what they wanted. Although honestly this is probably a nitpick more than anything, the bohrok kal are still cool, even if I like the standard bohrok more.