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Don't have enough time or interest to write a lengthy review here, so I'll summarize:
Diablo 3 - Terrible departure from what made the series awesome by a dev team who clearly never played Diablo 2 and is just abusing the franchise for its name.
Path of Exile - Awesome throwback to the earlier games made by a group of diehard Diablo 2 fans which only makes adjustments where adjustments were needed.
It's in open beta right now. Try it. I know it's hard realizing that a game you have waited several years for is going to suck (I share in your pain), but it's time to move on.
Path of Exile is the true Diablo 3.