The frost ultimate is what looks bad: almost no effects whatsoever. I don't know if it changed for launch, but it was reported--and no just from me--as bland. Too bland for such an expensive, iconic ultimate.
I am pretty sure during an early preview of Warden gameplay had the buff as your character literally encased in a blocky cube of non-translucent ice. If i can find an image I will update my post.
I like it. But I was a beta tester and remember the horrible visuals the ability had before they changed it. Your character looked like they were stuck in a large ice cube. Everything is better than that and I am glad they listened to our feedback.