This is D3, a game different than D1 or D2, with new features, rules, mechanics, engine, etc.
This is true, the problem is not that D3 is different or that it has new features, the problem lies in the fact that these new devs deviated from what Diablo is all about.
It is no longer an ARPG, all thought process has been stripped away, leaving a shell of mindless, arcady-click-and-see-flashy-colors-on-your-screen, boringness..
Skills (both mechanical and player-based) no longer server a purpose on their own, this game is 100% about gear and nothing else.
There is no challenge, leveling characters is tedious and monotonous, there is no level randomization. Just a linear walk through the park.
Boring 'monster' affixes (yes, monsters.. when the hell has Diablo been about monsters? we slay demons in Diablo, He is the lord of the burning Hells afterall, this isn't my little pony, no matter how much they want it to be).
Without DarkD3, the game is a ridiculously colorful headache, the game has no pentagrams, no bloodied impaled bodies hanging off of the walls, no eerie ambiance, none of that..
The game has been made for children, yet they slapped an M rating on the box, which for the life of me I still haven't been able to understand why.
If you played Diablo or Diablo 2, and I mean played it, not just turned it on for an hour, killed a couple things and quit.. then you'd understand where OP is coming from.
This is no longer Diablo, it's something else entirely.
Sure we may have classes, skills, and loot... but so do many other games.
Diablo was what it was for specific reasons, and D3 fits ZERO of that criteria.
This game is Diablo in name only.