I didn't have a problem with it at all. Picard made peace with Hugh because he was an individual, not a drone. Ditto with 'Descent'. Once the Borg were once again back in his face and trying to destroy everything that he held dear, it would have been even more
unbelievable if he had just sat back and said, "Oh, those silly Borg. Assimilate this and resistance-is-futile that . . ."