Pros:
-Dealing huge dmg and can slow all enemy team
-Can farm very much very fast
-short cooldown on abilities
-Great in teamfights
Cons:
Die fast without Undying rage Undying Rage and Bloodlust Bloodlust
Not very strong early game - you need a good start.

When tryndamere goes in a teamfight, make sure he is not first! without his ult he die very fast. Come after the tank and use spinning slash Spinning Slash to deal huge dmg to enemies and if u die use Undying Rage Undying Rage

Spinning Slash Spinning Slash is a Great farming abilitiy, together with some critical chance (every crit. reduces the cooldown on spinning slash Spinning Slash for 1 sec)