It has good and bad points.
Fighting feels smooth. Skills feel like they have meaning and are impactful without looking too much like a slot machine. Graphics are excellent.
Level scaling feels terrible. There is no sense of accomplishment when you level as everything scales to counter the progress. You never get that feeling of owning previously hard content when you level or get a good item. Playing with someone 20 lvls lower than you makes you feel like you didn't progress at all as they will be doing the same damage as you.
Builds are super gear and paragon dependent. Also, they have so many modifiers that you don't seem to do much damage until all the modifiers are stacked for whatever window you have. They snuck in D3 modifiers it appears.
The grind is super monotonous. This is compounded by the previous issues.
There is much more wrong, and as I write this I am realizing this really isn't that good of a game. I am already losing interest and am forcing myself to get on in hopes that later content will be better.