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Although the Runic people are perfectly fine, the forums are filled with personal attacks and Runic doesn't really care. Runic seems to have the attitude that they just release the game and let the community police themselves.
I thought the D3 forums were bad, but most people agreed with the problems in D3. The TL2 community is incredibly fractured. It's pretty discouraging when all is said.
A fair amount of the player base is pretty bad as well. I never had a bad experience in D3 multiplayer. In TL2, you have people kicking joiners left and right. Certainly some of them are just griefing because Runic gave them that ability.
I'm pretty disappointed with Runic at this point. It didn't help when they label anyone using the console with the term "cheater".