Most Useless/Underrated Side Effects?????

So what do you guys think?

Example:
Bonus speed from Culling Blade
Dispel from Eul's Scepter of Divinity

One of the most underrated side effects on low level games:

• Jinada - 25% slow;
• Life Break slow;
• Mana Leak stun;
• Generally attack speed reductions, like Frozen Sigil or Shiva's Guard (I think they mostly care about movement speed slow);
• Corrosive Skin magic resistance bonus (I know there was a discussion recently about it);
• Heaven's Halberd and Last Word disarm.

On medium and high levels nothing should be considered useless, and I don't think many effects can be considered underrated. If somebody knows game well, he will know when is the right time to use that certain thing.

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But I do know what is highly overrated:

Hand of Midas and Battle Fury.

Untouchable
So good...
Just so good...

vladimir's offering's benefits apart from lifesteal, 5 bonus armor to your team is not a joke, and stick that 15% bonus damage on a high stat carry, even a ranged hero for example morphling really benefits from it.

And skadi's 45!!!!! Attack speed slow.

You did not get the concept of that thread. We are not talking about skills in general, but side effects of that skill/item abilities. Untouchable has only 1 effect - slowing enemies attack speed, thus - your comment is irrelevent, but still I appreciate that.

Even though, I can't agree that Untouchable is underrated. I think that rather on low level games players say that this is completely OP and unbalanced.