I can't really comment to the first one since I haven't reached Inferno. I will say that I think that so far (late Act III Hell) difficulty has scaled just fine, with my only gripes being some truly wretched elite mob combos (jailer/plagued/mortar or invincible minions) that I either just try to avoid or leave the game and start over if it's that big of a deal. At no point do I think the game has been UNFAIR other than those few instances, and well, randomness is randomness- random spawns mean that sometimes you just get fucked. If half of what I hear about Inferno is true, then I'll probably have some stuff to say about this when I start playing on it, but I tend to try to be as OP'd as possible and I'm playing one of the two classes (Wiz, other being DH) that people say you can solo Inferno with.
Items do suck. That video is spot on. Later in the game, you want +int/dex/str depending on your character, +resists, +vit, +atk speed for sure. Everything else is either just a kind of nice bonus (magic find) or utterly worthless to surviving and thriving. The fact that the BS is such a crapshoot and waste of time means that you pretty much HAVE to use the AH at higher difficulties, and I kind of wish there were one or two more search parameters to set. People say the jeweler is worthless because you can buy gems on the AH for cheaper than it costs you to craft them, which is shitty. Blizzard's "solution" of only requiring 2 gems is kind of laughable- you're wasting RON PAUL'S PRECIOUS GOLD to combine gems, and that's the problem, not the number of gems it takes to combine. Hurp a durp. Blizz have pretty much copped to legendary items sucking by saying they're gonna buff them in an upcoming patch.
The last one... are you fucking kidding me? I long for the day that a game of this caliber can come out and not spend any money on fucking cutscenes or backstory. Just give me shit to kill and loot. Good vs. evil is implied in the "heavens vs. hells" nature of the game. It's named fucking "Diablo" for the love of God. People that would even rate this as much of a problem as the first two are why videogames suck. Go read a book or watch a movie for good narrative, you ain't finding it in videogames you pretentious assholes. There two possibilities for a game that tries to go the "art" or storytelling route- the gameplay suffers due to finite resources and you completely fucking fucked up allocating them for something that doesn't matter; or you have good gameplay sandwiched in between your stupid fucking attempt at a story, aka "metal gear syndrome". That's it. There exists no videogame with storytelling that is even on par with Billy Madison. If you disagree, go die in a fire. If you wish this wasn't the case, REALLY go die in a fire.
To sum up:
Point 1: Jury is still out for me but everything I hear makes me want to agree
Point 2: Absolutely
Point 3: Die in a fire