When it was first announced, I was under the impression that the Creeping Ooze would become a gamechanger. Yet with slow now essentially becoming a defaulted ability in almost every team played, I'm starting to see its become less of a gamechanger and more of a versatile, but space-wasting necessity.
It's low hit point value at max level also makes it far from a requirement to max level this monster out in order to stay competitive. I often find that using a golden Creeping Ooze satisfies my need in the monster in almost any format.