Note Blaze, I wouldn't use game mechanics and saying 4 guys are needed to take on one droid. That just seems sort of ridiculous.
no, it's a valid and comparative way to scale their power. None of the main PCs' companions are as strong or are ever depicted to be as strong as the PCs themselves.
And it's not just any droid but the infamous jedi-killing assassin droid of Revan's design, who accompanied Kreia and the Exile and definitely was no pushover.