Well, I've had around 40 disconnecters along the weekend. Only 2 I would deem justified, since I stalled to win for time (we were both with only one wall left each and I needed to have more life than him). In most of them, I out skilled the player and he ragequitted. Around half of them were carrying ubers. I've been following all the OU rules even if they don't apply there. And I've not disconnected a single time.
I just wanna say, that if the korean player with 1700 points who was using a yanmega, a rotom wash, a garchomp and a cresselia is reading this (I know that's not the case), I hope your north counterpart gives you salutation. I'm probably getting DQed without having disconnected a single time.
These are a bunch of my battles:
http://www.pokecheck.org/?p=search&vid=&hasot=7139
Oh, and one last thing. Every single opponent with over 1650 points that I've beaten have disconnected. So I'm sure there are a bunch of these posting here about how they "are above 1800 but will probably get DQed because of their opponents' disconnects".