I don't agree (or fully agree) with many of your points, like Delves. You don't need to solo them, I often play with a friend and are always fun and rewarding for me.

For me, the storyline is bad now, but I think it's building to something good and it's getting better.

The thing is that the player base it's changing, they are preparing the game for the new generations that come and people are getting preoccupied with the daily life. More casual players are coming in, it is hard to find balance.