I don't get this. SO FEW THINGS are actually changed in 2.0. I mean the game is 99% the same. There were just some super small things that RUINED the rest of the game. So much of the core game was unbelievably good. You had just a few tiny decisions that ruined everything. Guy will go down in infamy, but I think its shortsightedness. The game was saved by doing what? Removing the AH, which allowed the tweaking of drop rates. What else really changed? Nothing. Yeah, the AH was a fucking abomination, but it had never been done in something like this before. All the bitching about the AH beforehand was the real-money aspect of it, not the existence of the AH itself. Hindsight is 20/20. So much of what the AH changed was very hard to envision in a world before it existed.
Here's what Jay ruined:
AH
Itemization as result of AH
Overtuning of vanilla Inferno
Enrage timers on normal elite packs
Here's what he got right:
Everything else
Arguably the stuff the original game got right (art, sound, animations) are the ones he was least responsible for.
The original difficulty balance sucked
The AH sucked
The way the AH affected drops sucked
The skill variety for classes sucked
The itemization variety sucked, and still sort of does (primary stat + crit + AS + all res)
The way legendaries were rolled (frequently beaten by uncommons) sucked
The 'unique' qualities of legendaries sucked
Repeating the game 3-4 times for every character to get to a somewhat challenging difficulty sucked
The way combat was *constantly* broken up by cut-scenes sucked
There were plenty of things that were wrong with the game at launch besides itemization, and most of them fall to the game director: Jay Wilson. Even design decisions outside of itemization were perfect, that is exactly the wrong thing to fuck up with a Diablo game.
As anyone that followed the game or played in earlier betas can attest to, there were also lots of systems that Blizzard invested into heavily which were scrapped, remade, and then scrapped again throughout the development of the game. The development team lacked focus from the top-down. After such a long development time we should have ended up with a bigger game (no tiny Act 4) with better systems in place. Instead we ended up with a shoddy mess which took almost a year to get an extremely basic version of the PvP system the game was intended to launch with.
Jay Wilson was not a good game director for Diablo 3 and he is rightly blamed for the terrible game we got two years ago.