I think the original had a lot of flaws, and it really doesn't seem like they fixed a lot.
Also the 'amazing new features', I didn't see any new systems? The only difference is 'at least 1 different class' and 'skill trees now cannot all be viewed at once' which is a step backwards right? :S That was a major crit of Diablo 2, and they corrected it, but now they have reverted :/
I heard they are using the new sparse octree voxel radiosity engine, but not sure if that is true, the game surely doesn't need it. In fact I would love if they simplified the game a lot more, it would really be great with vector graphics ~ !
I will probably buy it for social reasons, but so far it looks more like a 'new episode' rather than a sequel as such.