Diablo 3 is retardedly bad storytelling that reads like bad fanfiction, part 1

Spoilers abound.

At the beginning of Act 1, we are introduced to Cain's adopted niece (huh?) Leah. I hate her. She doesn't believe in any of the things Cain is researching, considering them silly stories despite the two of them being holed up in Tristram. That is to say, NEW Tristram, because old Tristram was burned to the ground by demons. Demons Cain saw with his very eyes, twice. Once prior to burning, and once after he was captured and about to be burned alive by them during the burning.

Leah is a stupid whore who doesn't believe in these silly stories or prophecies. The dead rise, though, so I guess she has to believe now? Oh, no, she says constantly how hard it is to believe it.

Running through town you get a bunch of dialogue about how great Leah is. Did you know Leah was tending the wounded all night? How crazy is that, because Leah was ALSO out first thing in the morning with the captain of the guard doing patrols. How selfless and awesome of our new heroine! I bet she makes friends super easy. She probably gets awkward around boys, though ^^;b

Anyway. During the build up to the climax of Act 1, you are sent to retrieve a MacGuffin from a port city you need to take a boat ride to. The city is overrun by cultists and you and Leah fight to the center of the place to help. As soon as you subdue the cultists, Leah says she has to go back to Tristram for some reason. As this conversation is happening, the basement to the town hall, the building you are directly in front of, opens up. You go there, Leah begins walking across the city to catch a boat ride.

Ten feet into the basement Magdha, the evil butterfly lady, appears to taunt you. She says while you were doing your heroic bullshit her minions snuck in and stole the item. You know, from inside of the locked room that you carved your way to. You know, through the huge crowd of guys she had trying to burn down the city to find the item. She then reveals she's kidnapped everyone, including Leah, who we saw literally not 10 seconds before this happens.

We rush back to Tristram, to Cain's house. Turns out nobody got kidnapped, they're all just being held hostage in the mild comfort of Cain's family home. Uh... Okay. You kidnapped the stupid bitch off of the boat to take her where she wanted to go, FASTER than the boat ride... You didn't think to maybe kidnap Cain and the other old guy and maybe like, hide them? Leave a note?

Guess not, because it turns out the reason they kidnapped everyone in the first place is to make Cain use his magical powers to reforge the three pieces of the MacGuffins you were collecting. She says that if Cain doesn't do it, she'll kill Leah. Oh no!

THEN, TO DRIVE HER POINT HOME, SHE BLASTS CAIN WITH A BOLT OF EVIL ENERGY. This causes Leah to become SUPER ANGRY and she lashes out with UNCONTROLLABLE SECRET POWER, killing all of the bad guys in the room. They explode into pieces because Leah is just that awesome and then she rushes to Cain's side. Cain reveals he is dying from the blast.

Let us go over this, because I really need to write it again.

They kidnap Cain, the only one who can reforge the sword. They also kidnap the helpless old guy Cain hangs out with. They also kidnap Cain's adopted niece, who is in another city entirely at the time and would presumably take at least one boat trip to arrive. Then, to convince Cain to reforge the sword only he can reforge because he alone is the last of his kind so only he can do it, THEY SHOOT HIM WITH A LETHAL BOLT OF ENERGY. They threaten him using the GIRL THEY WENT TO LITERAL GREAT LENGTHS TO KIDNAP, AND THEN THEY SHOOT HIM. HIM, THE ONLY PERSON ON THE FACE OF THE PLANET WHO CAN DO WHAT THEY ARE ASKING HIM TO DO. AND HE DIES FROM THE SHOT MOMENTS LATER.

I... What?