No more need to ask to join parties, ask directions, trade items that dropped, 4 player max game makes it feel like a small get together much less a, "party". Instant teleport to players, instant teleport to next level of dungeons, pvp is separated from campaign games so far less people will team up and fight together. There is no making unique games, searching for specific games, it's all instantly done for you, matchmaking system is horrifying for d3 and i'm sure there is more.
I don't really know what to say, diablo 2 and even games before it's time had 10 times the greater options for social interaction than this, why would anyone design such a poorly designed system, it should be obvious to anyone that is not influenced creating bias towards the mechanic.
Anyone else agree or would care to share their concerns? I played d2 for what? 12 years to this day now? And I still play that game hardcore, and a lions share credit for that is the great communication it offered, I could never play a multiplayer game for long that was pretty much a single player game, it makes no sense to me?