Practice...and very tiny bits of 'skill'. Tiny, tiny bits.
Eh? If skill matters so little, why would practice help more? The point of practice is to build up skill. Nothing else (well, in RL, muscle and such, perhaps, but that doesn't apply to SL). Practice leads to skill, so if it is important, so is skill.
Any gamer who's good at any of the real PvP games (CS, BC and what not) will probably laugh their ass off at SL PvP.
I don't think this is true, actually. A lot of the people that seem to enjoy SL Gor's combat do play such games. And if you have 20 buttons, that doesn't mean that the 'skill' you need is all that much greater. It can mean that, but it doesn't have to. Many PvP games are still pretty straight-forward at heart, with aiming, dodging, timing and such being the basic factors. I agree that SL Gor's combat is fairly limited (could be much better with a few significant changes, I feel), but, overall, the core combat aspect isn't necessarily all that different. And as laggy as SL is, it still relies on actual aiming, pointing, timing. As far as I am aware, games like WoW don't require aiming. In fact, that makes them much easier, for me. More about tactics and less about 'skill'. And combat in SL feels 'harder' to me (not being a great aim-bot, myself).