I quit because of the tedious boredom. Farming for items just wasn't fun or interesting. Leveling up felt like a chore, and no matter how strong I got, I always felt weak. This game just doesn't have the panache of Diablo 2. That and all the gold farmer/ad spamming got so damned annoying. Had like 10 friendship requests everyday from random assholes named awejifaowejfoaweoif.
That being said... I still have it installed as I'm a huge Blizzard fanboi.
Still got it installed, 100k whirlwind barb, but I won't touch it again until pvp comes out, the core game is just monotonous and lacks any depth like diablo 2 did.
You might be behind a lot then Sword, especially with the paragon levels now implemented. If you wanna PVP, better get back to grinding those paragon levels. I heard 1 paragon level takes as much time as leveling from 1-60.