The Borg are OP. They lie about their abilities all the time. In BOBW, they were (probably) poking at the Federation with a lone cube to see their capabilities (and the Feds were barely capable). In First Contact, they're just there to test out the time vortex. They shrug off the minuscule ships then practically shout at Picard how to "beat" them so they can hitch a ride on his ship to hang out in the past and play around with Data.
The Scimitar should be no challenge in a head-to-head matchup. Unless the Queen has a favored protege onboard, then she might sacrifice some cubes to keep it around for future observation.
The Scimitar should be no challenge in a head-to-head matchup. Unless the Queen has a favored protege onboard, then she might sacrifice some cubes to keep it around for future observation.