I've definitely had more positive than negative experiences with DF.... but having said that, I much prefer running with Jp groups just because of the way they generally behave - I *expect* a Jp group to play as a team, start every instance with "yoroshiku" and respond to every death/screw up with some variation of "donmai!", but with random English players it's a real mixed bag and I'm sadly not surprised when somebody starts flipping tables if someone dies.

Still, this is why I'm in an FC and why I hope they'll implement cross-server friend lists!