It's been a while since I've gone into PVP, but when I was, I was almost always in the top 3 for damage dealers, so I feel like I was at least doing decently xD

When waiting on CD's for bursting, I would usually harrass with DoTs on anyone nearby. Don't expect to gets kills with it, but it keeps their health going down and if someone gets targetted, you might get the lucky kill due to your DoT. Fuma shuriken is great long range attack when your chasing a fleeing target with low hp (but the worst when they get healed RIGHT before it lands T_T). I used dancing edge more often than aeolian edge, simply because the positional was difficult to get when in the heat of the battle (and it has a higher attack potency if you aren't hitting the positionals, plus the debuff is useful).

Hyoton actually becomes useful in PVP. Took me a while to get used to using it as it's pretty much ignored in PvE. Doton can be very useful if you use it as a chokehold or trap since it heavies. I liked to use Shukuchi to pop ahead if I saw an enemy retreating (and I wasn't being targetted) and placing down a quick doton in his path.

Also, don't forget about Hide ^^ Great for sneaking behind and harassing a healer at the beginning of a fight. Just be careful of AoE from mages, it will still hit you and you'll no longer be hidden. But great way to get off a trick attack right off the bat on an unsuspecting victim. Use your stuns/binds wisely, you have 3 in total you can use on a player. The rest is pretty much dependent on your team. Your solo burst isn't the highest, but can definitely down someone if they're not paying attention. As others have said though, be careful of blood for blood. Those PvP'ers can smell the blood in the air ._. (and it'll be yours if you don't pop it back off in time).

But I will say, I haven't PvP'd in a few months. I know there's been updates to PvP play and I don't know how many have affected the NIN. Be nice to see a main NIN PvP input ^^