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Movement speed quints have always been under rated, but in dominion they are even better. Just depends on the amount of punch your champ naturally has out of the gate. If you can still be affective without the armor pen quints or flat ap quints or whatever out of the gate, then Movement speed quints are very nice.
Really one of the main things to consider is whether your champ has skill shots. This helps a lot with maneuvering into position to land them.
It is champ dependant. If your champ has short range abilities and needs to kite, these will help you pop in and out of range.