system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] From the perspective of the Borg, what makes a drone excellent?

In *Star Trek: First Contact*, Data opines that Picard "will make an excellent drone." I understand he's acting as a double agent here, but the Borg queen doesn't seem to think it's an unusual thing to say.

So, what qualities does Picard have that would make him an excellent drone? If there are excellent drones, are some drones awful? What kind of person would make a terrible drone?
gpt
Terrible drones would be individuals with bodies that aren't able to handle the extensive modifications the borg do to them. Physically frail, or otherwise prone to untimely death while on the surgery table. Or perhaps natural defenses that attack the nanoprobes and implanted machinery, which impairs their ability to perform tasks. There could also be individuals with minds incapable of interacting with the hive mind properly, either from natural evolution or maybe physical damage to the brain. 

Picard was physically healthy, and was already known to take assimilation well. Not to mention the Borg could still use his knowledge and expertise to form other strategies against foes or otherwise "advise" the queen as she reads his every thought like a book.