Hey,
I’m an old geese with thousands of hours spent on the Diablo franchise. Not here to lobby for that, just to give a little background as to where I draw my “inspiration” from. And, to make this clear, I bought the game as a “fix” before D4 comes out but frankly I’ll stick to it, especially if some things get a little bit polished.
Ok, so all I’ll have to say should follow the following principle: the enjoyment of the game IS the grind, the grind for better loot, that hard to obtain item which when it drops you get your high 
. For me anything that breaks the pace, unnecessary, simply adds no value.
To that end:
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Please make dismantling of items easier. Either give vendors the ability to sell an infinite amount of runes or just get rid of them and replace it by a 2k fee. The point is that gold seems pretty easy to get by and I basically end up doing vendor runs to get 20-30 runes to just clean up the inventory. Wasted timed that is, much rather killin’ mobs
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This is a weird one, maybe it’s something core to the game somehow but… why do maps reset when I teleport (using the portal)? It kind of breaks the progression feeling, having to go AGAIN through the same mobs (not to mention that I really need to pay attention where I teleport, even if I killed everything in sight, because when I get back I might be in a pretty delicate situation which I can’t get out of even with the invincibility buff… I DO need to move/attack at some point).
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Please make the transition zones less “immersive”. Maybe it’s just me but a lot of times I simply moved to one area only to accidentally go back to the previous area by moving in the wrong direction (not even clicking on the “portal”). It happened enough times to be frustrating, even more so when it’s coupled with the 2nd point meaning that there were maps that I accidentally reset (by moving too close to some “cellar” area or something).
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Add a rune that ADDS reforging capacity (min-max range). Make it legendary or whatever, hard to get, but the point is that saving for those just gives the player another option of not just getting a good item from time to time but actually FORGE a great item, even from scratch - which would give a good sense of achievement. I mean the whole forging system… I LOVE it. Just expand and play on it a little more.
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Expand gold pick-up area. Seriously, unless you’re planning on using that area for other things then there is no reason why you shouldn’t do it. Again, reduce the unnecessary fluff and let us kill mobs while hoping for that godly drop. That’s why we’re here.
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Auto-loot mats. Again, coupled with a low area of looting, this makes no sense, especially since you already have the virtual mats inventory. There is no point in us clicking on those (in a very clicky style game anyway…) only to go into our inventory and… click on Transfer. Seriously
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Mark for selling (or coupled with infinite dismantling, mark for dismantling). Again, this is simply convenience. Let us mark all items we want to sell and/or break apart and do it in a single click (provided we have the runes/gold for dismantling for example).
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Subjective maybe but I find it difficult enough to differentiate between the item rarity levels quickly. The hue is simply to faint… maybe I’ve god bad eyesight (which I do btw, especially in the last year it went downhill fast) but still, make Unique and especially Legendary unique items at least stat way, way more. Shiny colors/auras for shiny stuff.
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What else… hmmm… I also love the implementation of Echoes but as others mentioned, maybe allowing to change the blessings once discovered would be really nice. Keep their quality (so that if someone wants to improve them they anyway have to re-grind the monolith) but at least give us the option of switching between them.
I get it, it might affect the balance, and people would switch to a different set of blessings depending on the boss so that might be a reason why you force a re-grind, but still.
Maybe there’s some way of doing it without running an entire monolith just for a chance to change (cause what you get offered might simply not be what you need for your new build). Add a penalty (10 echoes until the “new” blessing becomes active while the “old” blessing is lost), the penalty being applied every time you change (so that if one changes by mistake they can re-change again BEFORE the new blessing becomes active).
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I hope the campaign gets expanded a bit. It was nice and all but really felt very short (and i’m the completionist type, didn’t rush it).
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What’s with all those waypoints not activating? It’s because it’s still beta or some other reason? Anyway, kind of weird not being able to activate a waypoint and then having to again run via the same level just to get to the objective.
And maybe more to come, I hope 
P.S. Don’t want to come off as a criticizing bully, I actually enjoy the game at the level of Diablo 2 LOD. A nice combo of “ah, the old nice stuff” and refreshingly new stuff. Congratulations, really happy I picked this up and most likely won’t go somewhere else for quite some time.