Do these people actually exist, outside of Blizzard forums?
There are actually quite a few problems with the game:
Some champion pack ability / base monster type combinations are completely impossible.
Act 4 is a complete bore.
The story is nonsensical.
The “caster” classes really should not depend on weapon DPS.
Where are my Necro-type curses, Blizzard? Where’s my freaking Confuse, Decrepify and Iron Maiden, huh?
Legendaries are worthless (being fixed, apparently).
Potions are double-nerfed: they are on a 30 second cooldown, and they don’t even remotely scale with with the life pools and damage done in later difficulties.
There is too little randomization. There should be way more of these “Events” sprinked all over, not just mostly act 1 and 2.
The game in general feels too short. Perhaps unfairly compared to the sprawling 5 acts of Diablo 2.
I have to pretty much abandon characters midway through Act 1 Inferno, or hit the Auction House (I chose the former, so far).
Why, by the nine hells, can’t my Barbarian equip a bow or Crossbow, Blizzard? The ranged Barbarian was quite a bit of fun in D2. I’m not asking to make him viable in Inferno, but at least give me the freaking option.
Melee Demon Hunters are completely non-viable in late NM and Hell (forget Inferno). Melee Amazons were actually a pretty good option in D2, however.
The above two complaints are basically related: the classes are more constrained into a specific role in this game. They are more varied than D2 classes were within this role, but cannot deviate from it.
Hit detection sucks. If I’m physically dodging something either by quickly moving away or using a skill like Leap and Vault, I should not be getting hit, damn it.
Hardcore is non-viable beyond probably NM. Too many crazy champion combinations that you can’t even escape half the time. Too many edge-of-screen instant deaths from things like Soul Lashers.
Lastly, as has been mentioned, having to do the Tutorial (Normal) multiple times is annoying. But can’t be helped, I suppose.
That’s off the top of my head. I had more complaints while playing, but forgot about them.