I think the concept of the queen was completely unnecessary.
I preferred the original Borg where there was no leader of any kind (nothing but a Collective).
Choosing a representative in BoBW was a special circumstance in preparation for mass assimilation, nothing more.
Voyager did good with the Borg in 'Scorpion'.
Enterprise as well in 'Regeneration' - hence why all 3 episodes were great.
Mind you, I enjoyed the episodes with the Queen, but I did feel she weakened the Borg.
It introduced a flaw.
Furthermore, the range of emotions she portrayed was 'too Human' if you ask me.
Though this is hardly Voyager's fault.
It only went along with what TNG did.