Plus we see all this impersive Borg technology that had been devolped to easily defeat the Borg, and it is hinted that Janeway helped devolp this technolgy with her two decades of expereince dealing with the Borg. Without those years of experience that technology may not be devolped. In addition, by bringing that technolgy in the past and letting it be scanning and examed by the Borg, makes it alot more likely that the Borg would come up with ways to conter that technolgy before it is invinted. Both those factors making it much likely that one of the consequence of Admiral Janeway altering the timeline could be the assimlation of the Federation.
-This episode takes all the fun of returning home, making it not a big deal. No one except Harry really seems to care that they made it home. And the ending of not even showing them after they returned to Earth was horrible. It was the greatest disapointment in Star Trek history. It has been suggested to me that it would be anit-climatic to the story to show what happening after they returned home, but I couldn't disagree more. In TNG's series finale "All Good Things..." After the plot is resolved they have an extra scence of the entire crew playing poker, which brought a great scence of closure to the episode and the entire series, it was not anit-climatic at all, it was spectacular. But this episode has no scence of closure, just "oh wow we're home. so what, show's over."
- This episode makes the Borg far too invincible. If the Borg were really has powerful as this episode makes them out to be they would have assimulated the entire galaxy by now. They show a Borg Subspace Hub that allows the Borg instant access to any part of the galaxy. Seven of Nine even mentions that the Borg have six of them throughout the galaxy. Then what are the Borg waiting for, why haven't they assimulated the entire galaxy by now. At the endd of this episode a Borg Sphere appears intantly in front of Earth.