1.You can only use Charge on a Monster if you are already not in melee range. This is the one drawback when compared to Sacrifice. You will have to back away or select another monster that is further away.
2.Sometimes Charge skill may stun yourself (you cannot attack and move but can drink potions) when attacking. This may continue very long until to your death. You can fix this by pressing the "W" key to swap weapons which should exit you from the stun.