Species 8472... well, yeah. Things went kinda wrong with it indeed. They're way too powerful, which is one reason they would've been hard to have around later on. Of course, it's a bit silly that they were described as a relentless killing machines purging the galaxy, and then toned down to a misunderstood race afraid of humans... but I suppose they needed some way to cut that storyline in their minds. I just wish they'd have put more foresight into that. Or just simply leave that episode out entirely. They retreated, and as such it wasn't necessary for Voyager to run into them again. It would've been just as viable an ending as the one they had. And both ways would've worked better if they hadn't been portrayed 8472 as too powerful (and as relentless killers) to begin with.
Not to sidetrack too much, but the Borg have a bit of a similar problem, really, what comes to being powerful. It's not as evident in the other series, but since Voyager focuses more on the Borg, it becomes very much so. For example the Queen says to Seven they need to understand the nature of Human resistance better in order to successfully assimilate them. This make no sense. If they wanted to, they could assimilate them. I wouldn't call a single cube or even a handful of cubes an attempt to assimilate something as big as the Federation.
Yet, let's keep in mind that a single cube destroyed a fleet of 30 ships in Wolf-359, and in ST:FC a fleet managed to destroy a cube, but not easily. So, the Borg have what, thousands of cubes? Send a few hundred all over the Federation at once, and the Federation is no more. For that matter, why would the Borg even care about the humans, when there's still plenty to assimilate in the Delta Quadrant (and for that matter, they've already assimilated the Federation's technologies etc)? And why are they sitting on their hands to begin with, they could've probably assimilated the damn galaxy already if they weren't slacking, especially as Transwarp and other assimilated technologies - Quantum Slipstream etc - allows them to get anywhere quite fast. But here we indeed run into the same issue as with 8472 - they're a bit too powerful to be used "logically".
Now, I've read that there's a novel taking place in 2381 where the Borg invade Alpha Quadrant in full force, but it's not canon, as with other novels. And based on the short description at Memory Beta it, in turn, downplays the Borg strength again. Because if the Borg really attacked with as many ships as is listed (7461), even if all of them weren't cubes they would easily destroy any and all resistance with a coordinated pronged strike aiming at important targets across the Alpha quadrant simultaneously before anyone could counter them. Resistance would indeed be futile.
Unless of course you have at least a few hundred Endgame-Voyagers with transphasic torpedoes and crazy batmobile hull armor to which the Borg couldn't adapt... doh
![Roll Eyes (Sarcastic) :rolleyes: :rolleyes:](/styles/flatawesome/xenforo/smilies/rolleyes.gif)
But even then they couldn't possibly save most of the planets before it'd be too late for them.