Spam silence is a little strong, it'd at least be a 6 sec CD :P but yeah Arm can actually be really useful. Though, personally I haven't seen a whole lot of use for it since solo-silencing T2 (back in tha day) and parlor trick level utility like silencing the Garms at the beginning of The World of Darkness all at once, or a handful of other enemies when they're casting spells that can be interrupted but aren't terribly threatening.

One-ilm Punch has a great ability, but in PvE, about the most useful thing I've found to do with it is spam it on the dark generals in ST when they've put up king's will, because they immediately begin casting it again.... and again..... and again, until they're dead. But that's still parlor-trick level useful, since, they should die before you've done it 3 times, and they're not that threatening.

I still barely notice the speed bonus of fists of wind. Dancing into earth briefly for big hits has saved my life before, but.... I can't say anything so useful about fists of wind. And the bonus is small enough that I still can't keep up with most enemies running away from me.