Yeah, but a mass silence is not that usefull, especially when you can have curse(which is the ultimate counter to anything in the game). And your silence prevents only the ults, which in most close fights(5-10m) won`t get used on the majority on the characters anyway(like you can prevent a dynamo from ulting...but you can do it with normal silence... so what is the point?). Not to mention it is rare for several heroes to be this close to you, and if they are..you got bigger problems than their ults. It`s basically coldfront with silence instead of slow, and cold front rarely hits 2+ heroes.