No not much dark magic. Odd, but I think the somewhat long cast timing is the reason for that. I've had an encounter with pursuers, which you pretty much gotta run away from them and the gankers.
The trick with dark magic imo is to either throw on GMB or be careful. Eating dark beads and pursers at point blank range may kill anything.
I always seem to get the pissed off players too. I get invaded by a dude who I knew (or thought was a ganker...he said he wasn't when I invaded his buddies world. They were looking for duels and I ran away....maybe because you both were standing mere feet away from each other when one of them bowed. Plus how many duels can one have in the forest? Nor did they repeat this behavior the 2nd time I invaded them) So I do the logical thing and bum rush him (with full giants, zwiel, and havel's). Figuring, I wouldn't let him have the chance for any dirty tricks. Well eventually I get beat down a bit and I pull out a DB (still thinking he is going to fight dirty).
This goes on through 3 DMB (Can you get 3 DMBS?) PGS (two of which I countered with GMB). Eventually it finally ends. He sends me the message calling me the worst player he has ever fought, (Well considering how I fought him off in a 2v1 and in 1v1). He says without the buff he was kicking my butt. Truth be told him using the PGS 2-handed and flip ring allowed him great mobility (now if only he didn't spam RB) which was hard for my zwielhander (I should have jumped to hit and run attacks). The giants armor was helping, but was by all means not my trump card. The fact that I had 2280 health was my trump card, but he needed to vent and so he did so by insulting me. Such an unhealthy enviorment Dark Souls creates.