The problem with Silence, as was experienced way back in Tempest Keep (though I will be honest that I haven't tried it out recently), is that a lot of mobs, particularly in raids, are actually immune to Silence, making it unreliable.

Also, because Psychic Scream has extremely limited use, especially in a raid environment, due to its tendency to simply pull more mobs, resulting in more harm than good, I would actually steer people away from these two talents.

I guess I was kind of unclear. I'll agree that Psychic Scream is basically useless in a raid environment, but the only way to get to Silence is to talent into 2/2 Imp. Psychic Scream.

All raid bosses are still immune to casting lockout component of the spell, but the interrupt component is still effective, and 3 talent points for a ranged interrupt is a pretty good deal, considering there honestly isn't anywhere else to put them.

I agree on all accounts. ;)

I'd say silence has saved my raid from wiping three times in ICC (twice to pull in Plague Scientists so we wouldn't accidentally pull a dog when we didn't want to, once on a Deathwhisper frost bolt), and saved us some inconvenience against paladin severed essences when we pull both Val'kyrs at once. That's is more than any alternative I can come up for those three points would have done.