Sinanju, assuming you're talking about the Scissor suit, is quite good. The damage output is nice, and even gets ridiculous at High OC. At mode 1, you're just a stunner with low mobility but good damage. Its not so bad with a good team mate. You can stun non stop to protect your team, but you have no way to counter most of the time when enemies get close.
Mode 2 gives you rock boost and heavenly mobility, allowing you to play Sinanju like a rock suit. Not!Char kick reloads fairly fast, and the melee is superb even without the Ghost of the Red Comet skill (which gives a little boost to attack speed). The only downside is you only have zooks as a weapon, but the good part is that the projectile travels nearly as fast as a beam rifle shot but not as fast. It is best to learn to aim bazooka-type weapons before using the w2.
爆ぜろリアル！ 弾けろシナプス！ BANISHMENT THIS WORLD!
00 Raiser, 00 7S/G, V2AB, Infinite Justice, HWS v, Master Fuunsaiki, God Fuunsaiki, SR Sazabi, Crossbone X1 Kai, X2 Kai, Harute (Final Mission Type) Stargazer, Crossbone X3, Sazabi
Upcoming projects: Arios Ascalon (100% Complete!), Crossbone X1 Skullheart (100% Complete!)
IGN - ホモゲーバスター
Ship 1 - Feoh