I have really mixed feelings. I just played the beta as a Wizard, and I am not entirely sure it is my game. The combat is not as climatic as I would like and the abilities seem a bit dull. I am not even sure I like the always use ability combat, it seems just very simplified. Not to mention the loot. I did not see any interesting drops or unique armor nor was there really any real customisation as I could equip anything I wanted on my mage. I.e. No armor classes or weapon classes apart from the odd offhand. And the health/mana system is just… why?
I feel that Path of Exile offers a better hack and slash experience in more than one way, and it actually adds a bit of new ideas to the genre, as opposed to simplifying it. I might end up getting D3, as well as playing PoE of course, but it just… does not feel right.