I really like it so far, the level of customization is huge, killing things feels satisfying, there is a good amount of difficulty, even at the normal difficulty level, I've not gotten past normal yet as I've been playing with a friend so I'm only towards the end of act 3, because our schedules are a bit different we can't always play together when we play so got an alt im working on when hes not around, and already it's giving more challenge than d3 did in it's hell difficulty. Sure inferno was difficult but it was the bs "we doubled it" difficulty at the time I did it. PoE doesn't feel it has that kind of bs difficulty.
The currency system feels different, I like the change away from gold, but I'm not entirely keen on the EC style of trading. You'll know what I mean by that if you played EQ way back in the day. A more common example would be like the old D2 trading system, except there's a trade chat where you can advertise rather than having to make games specifically for it. I just don't like that it obfuscates the value of things, making it so you can easily rip people off or get ripped off because neither of you really know the value of things..
The art style is something that I really like, it looks a lot more dark and gothic, and realistic, unlike D3 did. Seems more true to the D2 style of artwork only in 3d instead of 2d sprites.
All in all the game really feels a lot more like a diablo game than D3 did, it feels very similar to D2 and is honestly what I really wanted D3 to be more like. I didn't expect D3 to be so far away from it's predecessor, but it really is, in just about every way imaginable, and not in a good way imo, which is probably why it was most peoples biggest disappointment of 2012.
On top of that it's free to play, with no way to buy power, except maybe in the old D2 way of 3rd party sites.
It's really fun, I came in with low expectations, and would have never tried it at all if it wasn't free after how bad D3 pretty much burned me, but it's pretty much everything I wanted D3 to be so far.
The only downside, which could really be considered an upside, is the amount of customization. The way you build your character has huge impacts on how your character is played, it's not all the same like it is in D3 with minor differences, and it takes a lot of experience and testing to really get the builds you want, which will encourage you to remake your characters just to get every point spent perfectly how you want it, but this does take time and experience to learn, so you will ultimately end up going through multiple characters before you settle on that build you want, because the skill tree is huge, making it easy to make choices you well regret later on. It's not newbie friendly in that way, but is something the hardcore really want to have, a reason to restart and play it again. Replayability is huge because of that.
Great game all in all, best modern ARPG I've seen.