Not that they aren't trivially easy to beat by sneaking, but use two (or even three) words of fire breath on a vampire.
Two words of Marked for Death turns the average dragon encounter from a 6-8 arrow affair to a 4 arrow one. Why waste the arrows?
I've found the one/two words of Kyne's Peace to be game-
changing saving. Ever get attacked, especially early on, by three bears at once? Wasn't a problem thanks to that shout. Much easier to use the AOE shout than the illusion spell.
Throw Voice is kind of fun because you get all three words at once, but it has limited use now that I have 100 sneak.
Dismay is useless compared to the Werewolf Howl.