If it's not an elf, leave it on the shelf.
I wonder what kind of demos the races of Azeroth would have been transformed into. Satrys from Nelfs is a pretty damn cool transformation.
Blizz has done a good job of keeping boss fights fairly interesting (more so on 10man than 25), especially when comparing it to other EQ style MMOs out there, but large group raiding doesn't really "tickle my pickle" if you will.
He would have gotten by us, but the guys in the top guild would have had him on farm.
Well we would be fighting for the legion. Like almost every other race they have overpowered.
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It's not like Isildur could have strolled into Sauron's bedroom and chopped off his finger, then waltzed out his front door. This is honestly the entire point why your view makes no sense, as pointed out with your own words. Now, as to it not really doing anything for you personally...that's fine. That's just a taste/preference. Not going to tell you you're wrong or can't feel that way, it just makes no sense.
At BEST another devastating war like Reign of Chaos, at worst, the Legion would conquer Azeroth.
Pretty much game over.
Sky Admiral Rogers for High Queen. Remember Theramore!Men, you've trained for this. You're among the elite. You are Skyfire men! This is the ship that took down Deathwing. You think some raggedy little Horde outpost stands a chance against the pride of the Alliance fleet? NO! Those green dirtbags down there plagued your homes in Southshore, laid siege to your children in Redridge, and massacred every man, woman and child in Theramore. It. Is. PAYBACK TIME!
A three sided war between the Legion, the Scourge and the followers of the Old Gods.
At the end, the Old Gods would win.
he would have despawnen and we would have tried again after a corpse run
I've never really been good at expressing my thoughts via text I guess.
This is an interesting topic. If Kil'jaeden successfully made it into Azeroth (assuming we weren't killed and could continue playing ;P), things would be different, but I don't think they would be world-ending. The Burning Legion would probably still have to ramp up its invasion over time, and couldn't just shove everyone through the Sunwell all at once. This would have meant our (the factions') attention would have been on the Legion.
Would the Lich King have taken this opportunity to wipe us out while we were distracted? Probably not. Why? Because he hates Kil'jaeden most of all, since Kil'jaeden was the one who cursed him with undeath and trapped him in a block of ice/suit of armor. The Scourge were the Legion's vanguard at the beginning of Warcraft III, but they betrayed them at the first chance they got.
Wrath of the Lich King, in that case, would have turned into a three-way battle between the Alliance and Horde, the Scourge, and the Burning Legion. The fighting between the Scourge and the Burning Legion would probably have meant that our factions would have taken a similar amount of damage in the long run. The tipping point may have been the Wrathgate. It seems that Putress was working for the Legion even in the canon story. That betrayal could have been much more devastating if the full might of the Legion was there to back up Putress when the Alliance and Horde counterattacked him. However, this also might have led the Lich King to forming a temporary alliance with us to cripple the Legion. The Lich King may want all life extinguished, but he's not an idiot. If there was an enemy that could take him and his enemies on at the same time, he'd make sure that enemy could no longer pose that kind of a threat before he returned to his normal course of action. Who knows, that necessity might have even rekindled the good in Arthas (and even Ner'zhul, he wasn't always a bad guy), although I wouldn't bet on it.
Perhaps the biggest danger that two fronts provide is that it would have been a distraction from Yogg-Saron. The factions may not have noticed his stirrings until he succeeded in breaking out. Of course, neither the Scourge nor the Legion would be fond of the Old Gods butting in, so that probably would have just turned it into a four front war.
Ultimately, I think we still would have pulled off a victory, but it would have been a very different victory. There wouldn't have been an all-out assault on Icecrown Citadel. Instead, everyone would have split up, each taking a different enemy and taking advantage of the chaos of a multi-sided war to get close without having to personally eradicate the entire army. Tirion probably would still have used the Ashbringer against the Lich King, considering its anti-undead nature, but I'm not so sure the Argent Crusade would exist in its current form. The multiple threats might have led Tirion to form a more varied organization, since they couldn't really afford to focus on the undead with the Burning Legion actively engaged in undead lands.
There are so many variables, but I think this is a really interesting question. It's not like Cataclysm, where the answer to what would have happened if we failed was: the world's gone.
A really good example from something I saw recently was One Piece Film: Z. At the end of the movie, who confronted the main antagonist? Just Luffy. Where was the rest of his crew? A couple of them were facing the villain's lieutenants, and the rest were facing ridiculous odds against his army of mooks. If the entire crew were wailing on the villian, it would have been impossible to showcase them all and might have given the impression that the heroes had no sense of honor or a fair fight.
Heroic armies on a single villain do not happen often in fiction, because it makes the heroes look weak or like dirty fighters. The opposite is okay, because you're usually meant to be on the hero's side, and we're used to rooting for the person going up against the biggest odds, so if a hero can take on an army of horrific undead or an evil military, it's something we're probably cheering on.
That said, you can make an army of heroes fighting a villain feel epic. As you said, it can easily be used to show exactly how powerful this villain is. The problem with that, in relation to Warcraft, is that it's applied to every villain. When it's not just the final bosses that require more than a handful of people, but every lieutenant and made-for-the-dungeon minion that needs a small army to confront, it doesn't make them look powerful, it makes us look weak. And that's ridiculous. This isn't Lord of the Rings Online, where the power level of the player is intentionally kept grounded. Outside of raids, it's clear that we're insanely powerful. Quest givers instruct us to wipe out armies single-handedly and we do it without breaking a sweat. Canon heroes like Thrall and Grom can duo one of the highest ranking demons of all time when the former had only recently come into his powers. That moment in Warcraft history was extremely epic. I don't see what's so epic about it requiring an army of us and a significant investment in time to take on a mundane orcish general. Against someone like Deathwing, it works. Against someone like Nazgrim? It makes us look like bullies.
Anyway, I'm not trying to tell you that you're not allowed to feel that raiding's epic, I just want to explain why some of us don't.