So I was perusing some of the schools and noticed the ice disciples titular unarmed buff ability seems kinda lackluster compared to the others.

The slow is a pretty small amount, and way less than other things - such as the Cleric's (masterable) dispirit! What's more, the elemental archer gets pretty much the same thing, but it also roots, while also having access to pretty much all the other disciples' abilities, too!

I think, with regards to ice, adding something else to the Freezing Touch would make it a bit better.. even just a little damage (significantly less than flame, obviously) to sweeten up the slow.. anything, really! Compared to lifetap, stuns, and DoTs, it just doesn't seem to have any real oomph at all, even as far as slows go.