at 800 mana basic? no thanks, got better things to spend mana on.

??!!

It is an anti-sedna/QoT/rook/erebus/TB/oak skill. Pop it in the right moment, all hell break loose.

If you are not feeling any benefit from it, that means you used it wrong.

I use it, but I don't get it until lvl 14 or so. I usually only put 2 points in it.

I use the silence ability once i get my heals to a good level or when im high enough to sacrifice a point for this ability. I didnt really notice much either. I think it can be useful but mainly noticeable with a magical guy like torchbearer. You can silence him then hes useless. Although i never thought of using this as an interupt i guess it can be used to stop the attacks well.

i use it every single game. i couldn't imagine playing without it

If someone ever silences you, you'll be amased how annoying that can be. As a Torchbearer or Lord Erebus, who depend on spamming attacks, you'll be pounding your attack keys until you can attack again.

It's handy to stop Oak and QoT from shielding, and for retreating demis from using the speed staff.

Gotta get in real close tho...

There's an audio bug with silence which I find rather amusing.  On low fidelity and system reverb off (settings I use now, my audio card sucks lol), whenever sedna uses silence, ALL sound cuts out. 

Now that's what silence should do at max rank.

Silence rank 3: Disables opponents sound and ability to chat.

The trick is you need to alter your build path depending on what you are up against. I don't have a static build for most demigods or always pick the same demigod for each match.

In the lobby I look at my opposition and choose the demigod that will work best against my enemies and work will with my teammates. Then I usually pick the same first 1-4 level skills but after that it's all dependent on what my opposition does.

Sedna for instance: If I'm going up against a TB, Erebus, Rook, or Sedna I'll get at least 1pt in silence. TB and Erebus beign silenced is a big deal because fireball, ring of fire, fire / ice nova, charm are easily interuptible and then they are silenced for 3 seconds which usually makes them second guess their strat and run away. Rook, if he's hammer slam or if he's going to structure transfer it's useful but you can generally use pounce too.

I used silence last night to great effect because I was up against a TB and Erebus. I'm sure it pissed them off a bunch of times.

The time I tried Silence was too early. (I am assuming from the suggestion at level 14). I was in a game with 4 TBs, two friendly two foe. I allocated the skill at lvl6, iirc - to try to get some counter against range casting DGs.