of the three people I got to play the game, 2 of which are PoE players I play with, as well as one who is PoE/Diablo.
One played purely mp, he went bowmage, got some gear, then went “this is boring” and quit. We also could barely play with him cause his character made the MP experience lag out from too many particles.
One played rip blood lich, and he still plays online(alone) a decent amount. He is the type to not need a game to really provide him 600 hours a week, he is fine just chugging along playing here or there, he didnt really like the MP experience. MP in campaign has disgustingly long load times, and when you do monos, the “not party leader” is just sorta along for the ride, they dont have much to do, they just kill monsters, they dont get to pick rewards, just choose between two random ones. They dont get to travel an echo web or make modifier choices etc. Also when I click an echo, his screen gets frozen with an “echo loading” thing that prevents him from looking at his stash etc, even tho after its done loading he does not have to jump in right away. Finding a way to make that loading of echos take place in the “background” so he can still work on his stash etc, would probably make him more inclined to play MP atleast for endgame.
The third player is the diablo/poe guy, he got to level 100 and geared out a smite hammerdin. He enjoyed the game, but I think again the MP was only okay, PoE multiplayer allows players to share resources much easier without having to play together all the time. My best way to explain this, is if you play a raid game a “Static” is the X number of players you always raid with. its not a guild thing, its just always THESE players. Vs a guild thing where everyone collects gear in a shared space/goal and its about the community aspect.
I think that once trade gets put in way more people will be willing to mess around in MP because you will get that Guild/PoE vibe where everyone hangs out, and maybe helps out with tough bosses or rewards etc, but can also have a shared gear pool to experience a sense of community.
So from my point of view, the problems with MP are right now
Stability; its not smooth at all when you have a 4 man that makes lots of particles or summons etc.
Loading times; Loading isnt seamless enough and there is so much just waiting around for shit to load. They need to figure out how to make this more seamless and background focused.
Agency for players not the party lead; If you are not the party lead in end game you miss out of so much progress/agency, you are just like a hireling getting a chunk of gold/items for being along for the ride. I dont know how to fix this. Cause PoE has map objectives. So often times at leagues start my friends all group up to share maps and we all gain objective progress. I dont randomly just get nothing but items for my trouble, im actually progressing my atlas and moving towards a goal.
tldr; the reason I find it was not a success isnt because the product does not have promise. But more so that there is so many pain points that need to be smoothed out as they all hurt and push away potential players. Like the guy who plays online from time to time still, he does not care about graphics, balance, whatever. He just wants a smooth gameplay experience; For example, he has actually muted basically anyone who talks in global chat. Because he does not wanna see random politics or other game talk or even LE talk. But the chat being unable to be disabled has actively stopped him from playing in current weeks. The sheer amount of bugs and painpoints is turning away the casual masses imo.