You know you are making a comparison between polearms, 1h, and 2H weapons, right ? Also, if it was so powerful, everyone would use it, it isn't the case at all, since there are only spears, poleaxes/bardiches, pikes/longspears, and the bec de corbin that are widely used. No need to change anything on this weapon, since everything huscarlton posted are real drawbacks that penalize you if you take this weapon over higher tier polearms.