Wake of Tranquility is an AE lull, not a mem blur. It gets very little use as far as I know on p99, since it has a short duration and the same resist rate as the single-target lulls. Against stuff that is blue you'll need to cast it more than once to lull everything in a pack, but you won't know which ones it sticks on and which it doesn't, and recasting hits mobs that are already lulled giving extra chances for a crit fail... it's bad.
There is an AE mem blur also (blanket of forgetfulness), which is great for, you guessed it, blurring a few mobs at once. It lets you blur a group without lulling first (single target blur would need lulls also or else stuff just reaggros) or more quickly cause you don't need to wait on cooldown of single target. It also has a higher chance to blur any given mob per cast than something like "Memory Blur" does, I think.
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