I'm fine with fighting all of the weapons in the game, but...
I think it's really annoying when a player switches to an estoc/bks/rts setup in the lategame. I understand it's one of the best options at that point, and I don't blame them for using it, but man...it's annoying, and a total buzzkill for me.
Even a little lag could always bag me a couple undeserved shots against a good thrust weapon, katana, or Balder Side Sword player. However, a pro with a quality Demon's Spear, or a dex Silver Knight Spear with a back up dagger maybe, would always whittle away at my patience.
If I couldn't at least hit them with some phantom damage, I'd usually just say eff it and pressure for the parry or backstab. Usually wielded a modest return.