Is succubus in savage species underpowered?

One of my friends mentioned wanting to play a succubus in a pathfinder game and wants to use the savage species succubus class for it though at a glance the succubus class in savage species seems underwhelming to say the least with low combat ability and low utility. (At least compared to a caster of the same level.) What I wish to ask is that is it underpowered or would it be something like tier 3?

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