It's good to be back! Or is it? Here I am again... I can't help myself.
When TNG did it in FC, no one cared. When VOY did it, everyone complained. Fact.
No. Your (unsupported) assertion is that "no one" complained in FC, and that "everyone" complained in VOY. That's not a fact. Besides, in FC:
1) It had been years since Wolf 359. Starfleet weapons technology had improved. At Wolf 359, Starfleet threw mostly Mirandas, Excelsiors, etc (older classes) at the cube. In FC, they threw Akiras, Steamrunners, the Defiant, and then the Ent-E (top of the line) at it.
2) That said, until the Ent-E arrived, the battle was uncertain. Would Starfleet have won on their own? Possibly not. It was Picard and his link to the Borg that allowed them to detect the weak spot and INSURE victory. So your point that "they destroyed a cube with conventional weapons in FC and no one cared" is moot, because they DIDN'T just destroy it with conventional weapons.
Then why were there nothing but complaints over how the Kazon showed up for two years, if they had both large territories AND were hunting VOY?
People complained about the Kazon because the Kazon sucked. Simple.
And yes, Scorpion is considered when the Borg's decay began. And yes, the audience DID want the Borg to be utterly invincible. Let's clarify, shall we?:
http://en.wikipedia.org/wiki/Scorpion_(Star_Trek:_Voyager)
Read the very first paragraph. Note what is said about how the episode was received by the fandom.
As for "THE FANDOM WANTED INVINCIBLE BORG" (lol), others here have covered that quite well.
1) The Borg after him was immune to phaser damage. In fact, it was made clear that all the new phaser weaponry they thought of was useless after a few minutes of use.
Yet they still found a way to re-tune their weapons so that they got ANOTHER few minutes of use, even as late as well into BOBW part 2. True, the weapons were only good for a few minutes each
time, but it wasn't like the Borg adapted once and then BAM, weapons are useless from then on.
For all intents and purposes, the Borg were invincible.
Except that they weren't.
I, Borg didn't make any sense as to how they could hide from the Borg and be undetected, but they couldn't do the same in BOBW.
They weren't trying to just hide
indefinitely in BOBW
, they had already been tasked with STOPPING the cube. In "I, Borg," they JUST wanted to completely hide.
Descent is exactly what I've been talking about when it comes to the VOY double standard. If VOY had hidden in a star's corona, and then used the star itself to destroy a Borg Cube, everyone would've hated that story. TNG did it and NO ONE CARED.
No. That Voyager never used tricks LIKE hiding in a star's corona was itself part of the problem. They just treated them like any old enemy that they could handle with conventional weapons as long as they weren't outnumbered.
NOTE: Since I know you're going to bring this up, I'm not saying "Voyager's conventional weapons being IN ANY WAY USEFUL against the Borg is a problem." I AM saying: "Voyager beating the Borg easily and repeatedly with conventional weapons, instead of sometimes just evading them with trickery, is a problem."
This double standard you love to ramble on about doesn't, in fact, exist.
EDIT: Actually, they couldn't hide from the Borg in BOBW. The only reason the Borg didn't go into the Nebula and blow them up is because they wanted Picard alive. And even then they still had those energy charges that drove them out of the Nebula. That's not hiding.
Uh... yeah, it is. They hid... until they were driven out. At that point, they were no longer hiding. Simple concept.
And... the Borg didn't go into the nebula because they had already decided they wanted to kidnap Picard? How do you know this? Regardless, the Ent-D crew certainly didn't know that, and they didn't express ANY surprise that the nebula did offer them temporary protection. Ergo, there was another reason the "hiding" worked successfully. Ergo, one can hide from the Borg, at least temporarily.
And in FC, it's just another case of the double standard that the Fed Fleet could damage the Cube but were PO'ed when VOY did similar stuff.
Covered in detail above.