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If you miss the days playing diablo 2; if you got disappointed by diablo 3; if you are still looking for a decent mmo; if you need a temperary game before you find your "the next mmo", check this game out.
The OB is coming in ~30hours. F2P, with some non-game influenting microtransaction options.
(It's actually a soft release as there will be NO character wipe when it's officially released)
It has a VAST passive skill trees that allows unique builds. Even with simular keystones (major passive/game machanic changing passive), you can still choose if you wanna go more offensive or defensive.....heck you can even choose how to be defensive.
Combine that with a skill combo system (you dun "train" skills. You obtain "skill gems" and you can use them by putting them into item sockets), you can have different playstyle than the 937489327 other players you meet. It is how diablo 3 was supposed to be.
PoE is more diablo than diablo 3. It's F2P. Check it out -- it doesn't hurt -- and you will, very likely, like it.