Aura Whisper has saved my hide many times. I love it. It's perfect for me.
Throw Voice seems to be random. Sometimes it's useful, most of the time it's not. I do love the insults it uses, though.
Storm Call, eh, I dunno. I only used it the one time I needed to right after learning it when I had an elder and frost dragon pair tag team me in Skuldafn when I was level 16 or 17. Yeah... wasn't a fun fight, even on Novice level.
Honestly, I don't find much use in Unrelenting Force. Not any practical or real use, at least.
Has anyone ever used Dragonrend and have the dragon completely ignore it? I mean they are glowing and they were hit, but they fly on as usual.
The only time I have consecutively had this happen is when I use only the first word on a dragon in a place that doesn't have the best landing places (such as the woodlands in the Rift). Sometimes, maybe 1/5 of the time, dragons will generally ignore the first word, no matter the landing places, but they never hover and attack when they're glowing.