You're right the delivery was bad but you're wrong that the mobile game isn't the problem. It is a problem. Who wants to play an ARPG on a mobile and spend the time doing it to level and gear up on a mobile?
I know I sure as hell don't.
The only reason I could see myself doing it would be if the mobile version was Diablo 3 and I could play my PC character on mobile to keep the progression going. But to have an exclusively mobile game? No. Just no.
And this isn't even taking into account the fact that the game is a total reskin of the Endless of God game which NetEase made. Absolutely no effort went into this and it's painfully obvious. They do not care.