Originally Posted by FeLpZ
im talking about wardens mail, not frozen heart, but nice tips
Well it seems to me like Warden's mail is best on a carry or mage who is looking for a good physical defensive item. The slow allows the wearer to either get away from an enemy who is chasing them, or fight better 1v1.
Thornmail works best when you have other defensive items, such as Warmogs or Frozen Heart. Either of these items will increase the overall damage that your enemy will do to themselves before you die.