D3 had fun gameplay, fun classes - despite its end game flaws.
D4 is kinda dead on arrival for me because the classes i tried were unimaginably boring.
I do not know how you make Druid and Necromancer boring but blizz has managed to do it in d4.
Feels like 1/10th of the d2 classes - and those were not particularly complex to start with.
Frankly i would much rather pay for storage tabs than have to grind X seasons for extra storage like in D3.
I hate "seasons" as a mechanic and rolling from zero for a class i already have maxed.