I'm not a NW player myself (I've had him in my lab since launch though, lol), but I know a few people that are. Basically a lot of what you're looking to do is pressure with shoulder charge, Ex Lightning, hatchet, and reflect. ALL of his special moves are amazing so a key is knowing when to exploit how beastly they are. A lot of the strategy I've seen is pressuring people with shoulder charge checks, being sure to punish every mistake with this, but the real goal is to force them to start ducking. Shoulder hits high, so you can crouch under it to punish (though not crouch block). Once people start doing this, you start using your saved up meter to use Ex Lightning. It is nigh impossible to jump out of lightning when crouched, so you're guaranteed a free hit; the Ex version pops up, so that gains you a free combo of your choice depending on the range. On jump ins, hatchet is great if you can anticipate it and it gains you a free combo, though Ex choke is his best option as the armor negates their jump in attack and you can combo into charge. Most of NW's BnBs end in a charge, so your opponent will be a good distance away from you most of the time. On rush down characters, shut down their options with your hatchet, charge, and Ex choke, wake-up Ex Hatchet and Charge are great gtfo moves. On zoning characters, simply use reflect (refer to the reflect guide to know what works and what doesn't, along with the time frames). Really learn to use reflect on reaction...it doesn't last too long to justify a prediction. If you're low on health, Ex reflect gains you health. Don't bother with fireball wars, reflect and ex charge are much better options. If ever an opponent is turtling, just use Ex Lightning to to force a move out of them. Ex shoulder charge has armor now, so use this to close the distance to pressure opponents (the second hit on Ex charge is an overhead, but can be interrupted between the two strikes). His X-Ray is good, but not worth using compared to how godly his Ex arsenal is. Meter management is key. Overall, he's a pretty defensive character, but he can really scare people with his offensive arsenal. He's best played in an intimidating yet patient manner. Bully people as much as you can...when played right he can really make people lose all hope and options.
IMO, he's probably the best character in the game.
Also, I know KrayzieBone mentioned he was working on some techniques with him, and there were a few people using him on the ECT stream. Check justin.tv/tymlive for some matches...though the quality isn't the best in the world (thank you Storms for doing this for us anyway! lol)
Suddenly I want to go back in the lab with him....
. Good luck at Evo!
