Ninja Gaiden II is so damn awesome. I liked the first one better though and I suck terribly at the second one. =| Which weapon is your weapon of choice? I like the Dual Katanas, myself, but I still haven't gotten the Eclipse Scythe yet.
I've all of them now, I'm so so close to comppletion of the game.
Really, don't pick a favorite weapon. Each one of them have very specific characteristics, and are best for different kinds of battle.
The Dragon katana of course is the most balanced, but I barely used it until now, I liked the other ones better.
Then I got a good reason for using it, but I wont spoil you.
I love the Lunar Staff, because it's power level is OVER 9000.
It has great range and power, and thus kicks ass, so it's a good choice when you have a medium number of relatively strong opponents.
Dragon's Claw and Tiger's Fang are simply awesome(yeah, I love most weapons), and I think their best use is against a really big mob of enemy ninjas.
The Kusari-gana's movement is wicked, use it against many(many) weak enemies. It can't be used to fight anyone strong, though.
The Scythe is FUN. It's so heavy that your movements with it seem comic, and yet devastating and bloody. Since it's slow, it sucks against large numbers, but when a small crowd of strong fuckers appear, it'll do the job with honor. Get it as fast as possible, it's really fun.
The Tonfa is fun against small to medium numbers of memium strength enemies. It seems like the less violent weapon in the game but OH IT'S NOT. It crushes the enemies, literally, instead of cutting them appart.
I got the Vigoorian Flail today, and I'm impressed, because even with the smaller range, it's greater speed makes it as fun and easy to combo as with the Staff.
There. Use all the weapons, they're all so cool.
I hope I helped
edit: I forgot to mention the Talons. They're the only ones I don't like. They're short ranged, not so fast, weak defense blablabla. Also Ryu looks like a fucking idiot doing flips and kicking like an angry kid and even running wearing the thing. I don't use them.