Well, more like not as braindead. I remember there was this theory the reason the Borg are so dumb because their networks have massive latency due to the Borg's insistence that every drone must be linked to the collective, meaning that responding quickly and utilizing tactics/issuing a response to a threat/assimilation/their thought processes are actually much slower than 'real' time, and that assimilation is a response to being unable to devote significant computing to research because of the above.
The Shivans don't have this, and on top of this, they actually possess an understanding of tactics and strategy beyond "walk over to bad thing and shoot/stab it".
Also, the new stuff confirms what I thought about BP Shivans: They're aren't actually a species in the normal sense, and are rather weapons directed by an intelligent entity when deemed necessary.