I've been saying it since I first played the game like a year ago, that they should have gone full ARPG-MMO hybrid. Maybe that's because it looks like Torchlight, but I've always thought it would have been appropriate if not straight up awesome.
- real action combat instead of this weak thinly veiled tab target thing. Think any game where mouse1/2 are bound straight to abilities, mouselook is default, etc.
- much much less questing and more dungeon grinding/exploring. I'll invoke Asheron's Call again. Big fucking leveling dungeons that are public, maybe some instances for story/campaign, but do not focus on linear 5 man runs, and fewer but really significant quests not just bear ass collection 1-50
- a soft trinity. Classes can be built like tanks, support healing, etc, but dungeons and content isn't tuned for 3 dps 1 tank 1 healer. The same way in an ARPG you can build just about any way you want. Just think of the variety of builds in games like Diablo 2. And resist the urge to ever design content for a particular group make up. Someone might say "GW2" which is essentially what I mean but just plain done better. GW2 is terrified of someone being a healer for example.
- remove dodge, or make it a limited ability. Dodge gameplay is just bad, it straight up ruins games. Movement related abilities are fine, but giving everyone dodge makes content all about dodge, and then you've made a terrible game. See: GW2, even single player games suffer from it like Witcher 2.
I don't know if people would sub to a game like that, but I would be way more interested in playing it than a WoW clone. There's a reason people invest countless hours into the ARPG formula. Add it to a huge seamless world, give it whatever MMO features you want like housing, crafting, etc. Take the rails off a bit and let people explore and find places and quests