User blog comment:Axelaspeed/Pricing Inconsistenies/@comment-7240970-20130405190033/@comment-5499190-20130406231524

It's got "good" stats/effiency, but not good enough. A staple fire backline right now would be Vivian with 875 effiency. You can buy PM ones for 220-240 right now, so let's say 230 on average, meaning around 19 PP per pwr. OTOH, PM Kronos is roughly 400 right now, which would be 25 PP per pwr. I'm pretty sure most people have enough space in their deck to hold PM Vivians, in terms of backline there is no reason whatsoever to go with Kronos over Vivian, and that's the problem as we've said.

It's skill means it's not really wanted as a main frontline card either as everyone wants cards that boost numbers (i.e. attack boosting cards).