I guess you can argue in "Regeneration" that they were basically acting on instinct and the knowledge the resurrected drones already had. Their primary goal seemed to be to set up a contact with the 'home' base in the Delta Quadrant. They had enough knowledge and abilities to do that without a 'queen'. When that first episode came out I wasn't sure I was going to like it. But I'll give the writers credit, they managed to do it while maintaining the continuity for the most part, and even offering a potential explanation as to how some people in the Federation, like Seven's parents, might have been aware of the Borg before "Q, Who?" (though it's certainly possible there were other hints about the Borg as well). Instead of causing a continuity glitch it actually tightened it up a bit. And since there were apparently few, if any notable, or significant contacts with the Borg for about 2 centuries the events in Enterprise, you could argue, were simply forgotten to history (and they were careful not to note the Borg directly by name in the episode as well--only we the view knew who they really were). And there portrayal in "Regeneration" reminded me of their depiction in "Q, Who?" which I kind of missed in other depictions.